In high school I had a strictly enforced bedtime because my parents liked to sleep 9-10 hours if possible and claimed they couldn’t sleep knowing I was awake. I had to be in bed by 9pm unless I had work or jazz band/pit orchestra, in which case it was 10. I got up at 6am for school, 8:30am on the weekends.
Last semester varied, as I avoided going to bed with homework whenever possible, so that could be anywhere from 11-2, and I woke up an hour and a half before my first class, which was at either 9 or 10 depending on the day. This semester I only have morning classes one day of the week (my hell day, 8-3:30, and I’ll have to get up at 6am because the classroom is a hike) and tried to sleep in until 10:30, but my room faces east and too much light comes in around 8:30-9ish.
I’ve found that it doesn’t matter how much sleep I get as long as it’s consistent; I feel better getting 6-7 hours every night than 5 one and 9 another.