I hit legs only on my day off work. Even though I haven't squatted in years, I still go 110% with everything else, ie, leg press, hacks, exts, curls, stdl, calves. Guess if I half-assed it I could do it on a workday, but that's just not me.
Apparently there's a shitload more to recovery chemically speaking than test/GH levels. Back when I was in my 20's & early-mid 30's, I was natty - test levels were probably 1000 tops. I could trash legs, then go to work at a physical job for 12 hours and think nothing of it. Then as 40's-50's rolled around, I could be on, have test levels of around 3000-4000, yet still incapacitated after legs. Sure being on helps some, but nothing to the point of feeling like I did when younger regarding recovery. Assuming nutrition & rest are in check now just as it was back then, why is that? Guess that's a fountain-of-youth Q haha.