This is pretty much how I work anyway as someone who technically should be working 5 8-hour days and I tell everyone on my team that I really don't care how much they're working as long as: their output is at least meeting expectations, they attend any meetings they're required to be at (although at this point it's almost only stand-up and 1:1s), and they handle on-call when it's their turn on the schedule (although we're a data team so the stakes are a bit lower in terms of incident response).

I usually start anywhere from 8-10, work until around 12-1, get some chores done/eat something/work out, work until around 4-6. Some days there's more in the tank or whatever problem is interesting and I can't put the laptop down. Some days I'm done by 3 pm because I'm not getting anything done. And sometimes it's like 8 pm on a Sunday and I have a great idea about how to solve something so I pick up the laptop.