I spend about 4-6 hours a day (M-F) in meetings or doing focused work, and probably another hour or so per day doing less taxing things like organizing my notes

I spend about 4-6 hours a day (M-F) in meetings or doing focused work, and probably another hour or so per day doing less taxing things like organizing my notes & responding to emails. I've definitely had busier times throughout my career where I've worked 50-60 hours a week, and I know others who work those hours pretty regularly, so OP's schedule is "normal" for some situations or types of people -- but definitely taxing enough to cause burnout and not a schedule I'd recommend maintaining long term if there's any way to reduce those hours. I agree with the other responses in this thread suggesting that you can really only get ~4 hours of focused work done in a day. OP, if you can cut some of your low-impact hours where you're working but not really getting much done, that's probably a good place to start.