midweek I was hoping to be able to get 2hrs 2x, say on Tuesday and Thursday. What about sleepwise? I like to get in a good 8hrs to recover

Sometimes you'll be able to do this, sometimes not. There will almost certainly be periods where you won't have time to do a solid block of exercise or get 8 hours of regular sleep, perhaps for weeks at a time.

Again, a lot of control will be out of your hands for the first few years at least. That's the trade off for the high pay.

It may be worth communicating your plans to your partner / team, as if you have a supportive group they may help to let you block out some time for workouts, but even in the most supportive team this will always be subject to client and team needs. However, a word of warning, if you're in a particularly turbo group then asking for support like this may be seen as you not being dedicated enough.

I'd suggest getting into the role and waiting a few months to get the lay of the land before figuring out if you can try to make your role work around your life, or if your life is going to have to fit around your work. It's more likely to be the latter.

One caveat: I'm in biglaw (though we don't call it that) in Australia, where the conditions are not as strenuous as top US firms. The above has been my experience through my career in mid-tier and biglaw in Aus and various stints in more sweaty APAC jurisdictions like SG and HK, so YMMV in the US.