The Transportation Security Administration (TSA) does offer a general rule for average flights, but really, there is no single answer to this question. The time you will need to get to your gate will depend on the airport, time of day, and destination.
Check out Smarter Traveler’s advice on how much time you should leave for check-in and security, and how to know when you should add (or subtract) more time https://bit.ly/2on85kP