Assuming they've been awake since 6.45-7am, school's 8.30 to 3 and the evening may or may not have had an activity (Cubs or one night a week's tutoring).
Note I'm talking about 'normal range' DCs here, so this scenario:
"Up at 5.15, muck out the horses, ride til 7, half hour flute practice, school at 8.15, sport from 4-6.30, homework 7.15 til 9.30, relaxation/family time, then bed at 9.45pm..." ain't us! So it's not a competition!
FWIW, DS2 (10.5) gets into bed at 8.30pm and reads til 8.45-50pm, then lights out.
Just curious about yours!