We currently aim for 7.30 on a school night but might need to push it a little earlier, it depends on how well I manage to get her to school in the morning.
I work on the basis that younger children do better with about 10-11 hours sleep
If you go to bed at the same time as your kids you could get up at 4:30 and get 9 hours in bed. Really there's a slider for "free time at night" and "free time in the morning" that you can adjust; my wife is a evening person, so she gets up 30 minutes after the kids are up. I'm a morning person, so I get up an hour before the kids are up.
I work on the basis that younger children do better with about 10-11 hours sleep