How often is too often for legs

I do em twice a week, Monday and Thursday. I have a set routine though, more than just squats and calf raises.

"The science" says that 2x per week for major muscle groups is the sweet spot.

My only fear with doing squats exclusively is that you could be in danger of becoming imbalanced. Maybe throw some unilateral exercises in there. Single leg presses, bulgarian split squats, ect.

Unless you know how to manipulate the squat to incorporate all muscle groups, then you need to maybe do something to focus on your hamstrings. If you're trying to work strength and posture, then weak hamstrings will affect these. Throw in some rdl's, lighter for higher reps after squats. These will work your posterior chain. Beneficial.

I'd probably back off on calves that often. Unless you're actively trying to grow them, then once a week, standing for high reps are fine. The calves are what ground you to the floor, you need to work from the bottom up, even if it's for general strength.

With squats/lunges, basketball, running hills, and jumping exercises, I sometimes feel like I might be overdoing it. I try to get at least one rest day/week for legs.

Squatober says "Hi"

Twice a week seems to be more than enough provided you let your legs recover properly of course.