If your court date gave you a deadline and you’ve got a job to get
to, the first thing you want to know is how long you’ll actually be at
the shop. The honest answer is that interlock installation time duration
varies — typically 1 to 3 hours of shop time for most vehicles, with
extra time for paperwork, training on the device, and any vehicle
quirks.

This guide walks through what really happens during an ignition
interlock install, what stretches the timeline, and how to plan your day
so you’re not stuck waiting. You’ll see a step-by-step breakdown, a
table of the variables that add time, answers to the most common
scheduling questions, and a realistic look at why two drivers with the
same court order can spend wildly different amounts of time in the
install bay.

How Long
Does Interlock Installation Take on Average?

For most passenger cars, interlock installation runs about 1 to 3
hours from check-in to drive-away. That window covers the paperwork, the
physical wiring of the device, a functional test, and a hands-on
training session so you know how to blow into the unit, what the lights
mean, and what to do during a rolling retest.

Not every install lands in that window. Older vehicles with simple
ignition systems can sometimes wrap in closer to an hour. Newer cars
with push-button start, hybrids, electric vehicles, and trucks with
complex wiring harnesses often push toward the 3-hour mark or beyond.
Add in a busy shop, a thorough state-required paperwork packet, or a
vehicle the technician hasn’t installed in before, and the chair time
can stretch.

The shorter answer most installers will give you over the phone: plan
a half-day. That way you’re not stressed if the install runs long, and
you have a pleasant surprise if it wraps early.

Why You’ll See Different
Numbers Online

If you search around, you’ll find everything from “30 minutes” to
“all day” quoted as standard. Both can be true depending on the
situation. The 30-minute claim usually refers only to the wiring
portion, ignoring the paperwork, calibration check, and driver training
that are part of a complete appointment. The all-day claim usually
involves a complicated vehicle, a state with heavy documentation
requirements, or a shop running back-to-back appointments.

The realistic average across most states and vehicle types lands in
the 1-to-3-hour range. That’s what to plan for. If your state or vehicle
is on the unusual side, the shop should give you a heads-up when you
book.

What Affects Your
Interlock Installation Time?

Two drivers can walk into the same shop and spend very different
amounts of time getting their device installed. Here’s a side-by-side
look at what typically moves the timeline up or down.

The biggest single variable is usually the vehicle. A 2008 Camry is a
60-to-90-minute job at most shops. A 2024 EV with a complex CAN-bus
system can be a 3-hour job even for a skilled tech. When you call to
schedule, the year/make/model is the first thing the installer will ask,
and it’s the best predictor of how long you’ll be there.

A Step-by-Step Look
at the Install Process

Here’s what typically happens during an interlock appointment. Times
shown are ballpark for an average passenger vehicle — your numbers may
differ.

Step 1: Check-in
and Paperwork (15-30 minutes)

You’ll show up at your scheduled time with your ID, court order or
DMV letter, proof of insurance, and any state-required forms. The shop
verifies your information, walks you through the install agreement, the
service contract, and the state-mandated disclosures. In some states
this is quick. In others — California and Florida tend to have heavier
packets — this step alone can take a full half hour.

Bring everything the shop asked for when you booked. A missing
document can push your install to another day.

Step 2: Vehicle
Inspection (10-20 minutes)

Before any wiring happens, the technician does a quick walk-around
and checks under the hood. They’re confirming battery health, looking
for any existing electrical issues, checking for aftermarket alarms or
remote starters that might interfere, and locating where the device will
physically mount. If the battery is weak or there’s an existing
electrical fault, the tech may need to address that first or reschedule
the install.

Step 3:
Device Installation and Wiring (45 minutes to 2 hours)

This is the longest variable phase. The technician runs the device’s
wiring harness from the engine compartment or under-dash area to a
discreet mounting location, usually near the steering column or center
console. They tap into the ignition circuit so the vehicle can’t start
until a passing breath sample is given. On a simple older car this can
be done in well under an hour. On a newer vehicle with a digital
ignition system, it may take double that.

Step
4: Calibration Check and Functional Test (10-20 minutes)

Once the device is wired in, the tech powers it up, verifies it’s
reading correctly, and walks through a series of test starts to confirm
everything talks to the vehicle the way it should. The Co-Pilot device
gets a quick functional check; if you’re using the Interlock Can, the
discreet alternative that looks like a soda can, the same test sequence
applies.

Step 5: Driver Training
(15-30 minutes)

This is non-negotiable in every state. The technician shows you
exactly how to deliver a breath sample, what the lights and beeps mean,
how to handle a rolling retest while driving, what counts as a
violation, and what to do if you get a failed reading. You’ll do at
least one supervised practice blow before you leave. Take this seriously
— most early violations come from drivers who rushed through training
and didn’t fully understand the rolling retest.

Step
6: Final Paperwork and Schedule Your First Calibration (10-15
minutes)

You’ll sign the install completion forms, get a copy of everything
for your court file, and schedule your first calibration appointment.
Calibration intervals vary by state, but you’ll generally come back
within 30 to 60 days. The shop can answer questions about ignition
interlock device removal timing if your compliance period is short,
and you’ll get the emergency
tech support number in case anything goes sideways before your next
visit.

Add those steps up and you land squarely in that 1-to-3-hour
realistic range.

How to Make Your Install
Day Go Faster

A little prep goes a long way. The drivers who wrap fastest tend to
do a few things in common before they ever pull into the shop parking
lot.

• Confirm your paperwork. Call the day before and ask
  exactly what to bring. Court orders, DMV letters, insurance proof, photo
  ID — having all of it sorted shaves 15 to 20 minutes off check-in.
• Top off the gas tank. Sounds odd, but a low-fuel
  warning light can trigger false starts during the functional test phase.
  A quarter tank or more avoids the headache.
• Charge the battery. If your car has been sitting or
  the battery is older than four or five years, get it tested first. A
  weak battery doesn’t just slow the install — it can cause issues with
  the device on day one.
• Disclose modifications. Aftermarket stereo, remote
  starter, alarm system, performance chip — tell the shop when you book.
  They can plan the right amount of time.
• Drop the car off. Many shops, including LCI service
  centers, offer drop-off vehicle
  service. You drop the car in the morning, go to work, and pick it up
  at lunch or end of day. The install still takes the same time, but it
  doesn’t burn your whole afternoon in the waiting room.
• Schedule midweek, mid-morning. Tuesday through
  Thursday mornings are usually the least busy at most shops. Friday
  afternoons and the last week of the month tend to be the most backed
  up.

If your schedule is tight, the drop-off option is usually the biggest
time-saver. You stop checking the clock in a waiting room and the shop
just calls you when the car is ready.

State-by-State
Variation: Why Your Friend’s Install Was Faster

Two people in different states going through the same court process
can have very different install experiences. A few of the bigger
swings:

• Documentation requirements vary widely. Some states
  want a simple installation report. Others want notarized affidavits,
  copies of the court order in the shop file, and a state-specific
  compliance form. Texas and California paperwork tends to run longer than
  Alaska or Oklahoma.
• Calibration and reporting schedules differ. States
  with shorter calibration intervals (every 30 days vs. 60 days) mean
  you’re back at the shop more often, though it doesn’t change the initial
  install time much.
• Required device features differ. Some states
  require GPS-capable devices, some require cameras, some require neither.
  Add-ons mean more configuration time on install day.
• State-approved device lists vary. Most LCI service
  centers carry 100%
  state-approved devices for the markets they serve, but if you’ve
  recently moved and need a transferred device, the install often runs
  longer because of the paperwork crossover.

If you’re moving mid-compliance, check the out-of-state
transfer guidance before you book your install. The paperwork is
worth understanding ahead of time.

What Happens After the
Install?

You drive away. That’s the good news. The first 24 to 48 hours are
when most first-time users have questions, and that’s normal.

You’ll need to blow into the device every time you start the car.
While driving, the device will request rolling retests at random
intervals — usually within the first 5 to 15 minutes after startup, then
periodically after that. The exact rolling retest interval varies by
state and device configuration. If you fail or miss a retest, the device
logs the event but does not shut off the engine while you’re driving. It
will, however, typically require you to pull over safely and provide
another sample. For details on how to handle that situation, see how
to handle an interlock device lockout.

The most common day-one questions get covered in your training, but
if anything feels off, call the shop. Don’t wait until your first
calibration to mention it.

DIY Installation: Not an
Option

A common search question is whether you can install an ignition
interlock device yourself to save time or money. The answer is no — and
not just because it’s against the rules in every state with an IID
program. The device has to be installed by a state-certified technician,
configured to your specific court order, and registered to your name
with the state monitoring authority. A self-installed or improperly
installed device fails immediately at the first calibration check, and
any tampering attempts are logged and reported to the court.

There are real ways to save on the overall cost (see how
much do interlock devices cost for a fuller breakdown), but skipping
the certified-tech install isn’t one of them. The shop time is
non-negotiable.

Frequently Asked Questions

How
long does interlock installation take for most cars?

For most standard passenger vehicles, interlock installation runs
about 1 to 3 hours from check-in to drive-away. That covers paperwork,
wiring, calibration testing, and your driver training session. Older
simpler vehicles often finish closer to an hour, while newer cars with
complex electrical systems, push-button start, hybrids, or EVs tend to
land at the longer end of that window. Plan for a half-day to be
safe.

Can interlock
installation be done in 30 minutes?

The physical wiring portion of an install can sometimes be done in 30
to 45 minutes on a simple vehicle, but a complete install with
paperwork, calibration check, and required driver training usually takes
longer. State rules require the technician to walk you through device
operation and verify you understand rolling retests before you leave. A
30-minute total appointment is the exception, not the rule.

What slows down
an interlock install the most?

The biggest time-adders are vehicle complexity (push-button start,
hybrids, EVs, aftermarket alarms), state paperwork volume, and shop
workload on the day of your appointment. Driver training time also
varies — first-time users with lots of questions add time naturally.
Calling ahead to confirm your paperwork and to disclose any vehicle
modifications helps the shop plan the right time slot.

Does the vehicle type
really matter?

Yes, significantly. Older traditional-ignition vehicles are typically
faster installs. Push-button start systems, hybrids, and electric
vehicles often require more careful integration with the vehicle’s
electronic control system. Diesel trucks, vehicles with aftermarket
security systems, and cars with non-standard wiring also tend to take
longer. When you book, give the shop your year, make, and model so they
can allocate the right amount of time.

Can I drop my car off
instead of waiting?

Yes, most service centers offer a drop-off option. You leave the car
in the morning, the shop installs and tests the device, and you pick it
up later that day. The actual installation time is the same, but you
don’t spend it in a waiting room. This is often the most convenient
option if you have work or other commitments. Ask about it when you call
to schedule.

What do I
need to bring to my install appointment?

Generally you’ll need a valid photo ID, your court order or DMV
interlock requirement letter, proof of current auto insurance, payment
for the install, and any state-specific forms the shop tells you to
bring. Some states require additional documentation. Always call the
shop the day before to confirm the full list — a missing document is the
most common reason an install gets rescheduled.

Will the install damage my
car?

A properly performed installation does not damage your vehicle.
Certified technicians use tap connectors and factory-style connections
rather than cutting wires permanently. When the device is later removed,
the vehicle returns to its original state. If you have concerns about
specific aftermarket equipment or a leased vehicle, mention it when you
book — the technician can confirm the install plan before they
begin.

How soon after
installation can I drive?

You can drive as soon as the install is complete and you’ve finished
your training session. There’s no curing time or break-in period. Most
drivers leave the shop and head straight back to work or home. Just be
aware that you’ll need to provide a breath sample before starting the
car every time, and the device will request rolling retests during your
first drive.

What
happens if my install runs longer than expected?

Reputable shops will keep you updated if a job is running long.
Usually the cause is a vehicle complication that wasn’t obvious when you
booked, or a piece of paperwork that needs a quick fix. If you’ve used
the drop-off option, this rarely affects your day. If you’re waiting in
the shop, ask for an updated time estimate so you can adjust your plans.
A good shop won’t rush a job to hit a clock — proper installation
matters more than speed.

Is
the install time the same for the Interlock Can device?

Yes, broadly. The Interlock Can
— the discreet alternative designed to look like a soda can — installs
in roughly the same window as the standard Co-Pilot device. The wiring
process is similar; the main difference is the form factor of the
handset. Driver training time is comparable. If you’re choosing between
devices, the conversation is more about preference and features than
about install duration.

Will
I need a follow-up appointment soon after the install?

Yes. Your first calibration appointment is usually scheduled 30 to 60
days after install, depending on your state’s rules. The follow-up is
much shorter than the install — typically 15 to 30 minutes — and the
shop will book it before you leave on install day. Missing a calibration
can trigger a lockout, so put it on your calendar immediately.

Can I get same-day
interlock installation?

Often yes, depending on the shop’s schedule and the state’s paperwork
requirements. Many LCI service centers offer quick appointment
scheduling, including same-day or next-day slots when available. Calling
first thing in the morning gives you the best shot at a same-day
appointment. Bring all required documents — a same-day install with
missing paperwork still becomes a next-day install.

Plan Your Install Day
With Less Stress

A realistic interlock installation time duration is 1 to 3 hours for
most vehicles, but the real-world range is wider once you factor in your
specific car, your state’s paperwork, and the shop’s workload. The
drivers who have the smoothest experience are the ones who book ahead,
bring complete paperwork, disclose any vehicle modifications upfront,
and use the drop-off option when their schedule is tight.

If install day is shaping up to be a tough fit around work or kid
schedules, the drop-off vehicle service offered at most Low Cost
Interlock locations is usually the easiest fix. You hand over the keys
in the morning, the certified technician handles the install on their
schedule, and you pick up a ready-to-drive car when your day winds down.
Call (844) 387-0326 to ask about same-day or next-day
appointments in your area, or to confirm what you’ll need to bring for
your specific state.