Aren’t the quali sessions like 20 minutes? Either that or 15. It’s very rare that it will be shortened, because most people tend to do a few laps, come back in, and then go back out, at which point the session is almost over. Obviously, if you’re happy with your time and want to save tyres, then you can just stay in and wait for everyone to finish. Maybe go and grab a snack whilst you’re waiting :)