I hit snooze once.
Sometimes I'll go back to sleep until it goes off again, sometimes I get up after a minute or two, rarely I have been known to hit it twice but usually 'cuz I really didn't know I already hit it the first time
Also, my alarm clock is set a bit ahead of real time -- I never remember it is ahead and if I didn't then I would always feel behind for the day ..... it is a built in cushion of time for me most mornings.