I think of leg day as testosterone day, I hit legs twice a week starting with Bulgarians, squats, lunges, hip thrust, calf raise (alternate seated and standing). RDL twice a week on pull day.Nothing wrong with working legs more frequently, I usually went back and forth between doing multiple leg days during the week and doing legs only once a week...
Typically when I was doing heavier compound movements like squats and deadlifts it was once a week and when I was doing leg presses and other stuff like hamstring curls and leg extensions I would split it up into quads and hamstrings/calves.
I was doing PPLPPLrest now I'm doing PPLrestPPL - I feel good going into each workout. I think full body 3x per week might be optimum but not sure I can hit all the muscles I want to hit in a full body, each work out already takes me 90 min.