It’s been a while, but when I was in high school, I was up at 6:30 so that I could run through the shower, get to 7AM jazz band late, be at school until 4ish, then off to my minimum-ish wage job until it was time to go to evening jazz/symphony/other bands. Home at 8 or 9; bullshit some homework for a passable grade; and then do it again (I was often doing homework during band practices). Weekends were music events.
I did not go to a top tier school, and I did not live in a top tier place. The stories I’ve heard from others indicates to me that my experience was not unique. I wasn’t even the most busy of the people I knew.
This wasn’t every single day, but it was more on days than off days. Contrarily, I had a great time in college because the pressure of classes actually felt like less than I was doing in high school.
this closely matches my experience graduating with a C average and getting accepted to a branch campus of a public university. I then crashed hard out of that school because, as you said, suddenly I actually had a lot more agency and a lot less responsibility.