Great question! Depending on how soon your appointment is after your inspection, you may want to choose a different day to bring your car in, as inspections usually take around an hour.
In most cases on average, car inspections take anywhere between 1 to 1.5 hours to complete. Car inspections are comprehensive and investigate your entire vehicle, so they can run a little long! They can also take longer, depending on the state of your vehicle, although they should not cost you more than $100.
Best of luck with the inspection and appointment!