It’s gonna depend on what you want and wanna do. I personally do 2 sets of hack squat, 3 sets of leg extensions, 3 sets of hamstring curls, 2 sets of sldl, 2 sets of adductors, 1 set of abductors, 2 sets of calf raises. However, I alternate on my leg days. I will do this once, then the next leg day I might lower my sets by 1 or 2 for quads and add a hamstring set, or vice versa. Or I might only squat once during the week. Or I’ll do hamstrings on a different day entirely.