How do you keep a car running for long periods of time without having to keep pressing the ignition every five minutes?

Answer 1: For cars with keyless ignition, you can keep the car running for up to five minutes by pressing the ignition button. However, the vehicle will automatically shut off after five minutes. However, if you actually hold down the ignition button, you get 40 minutes of runtime before the vehicle shuts off. This gives you a lot more time to work with, especially if you need to keep the heating going for certain tinting tasks (or anything that requires power). This trick should work on all GM and Cadillac models, plus a wide range of other vehicles that use keyless ignition.