Well I have a gym in my house for one. Todays plan which everyone will say is wrong is simply 5-6 sets of 20-30 hamstring curls. That is it that is the entire workout plan for today. I don't know what works for other people but that is the stimulation needed for my hamstrings. They are going to get all the attention and all the recovery and one simple movement probably 100-150 reps.
I'm not saying that is wrong, but it is a lot of reps. Whatever works for you is what you should do. Most folks I know would do fewer reps when working an area (like your hams) that is weak, as in not well developed. I have used a routine that works hams and calves in the same workout using 3 or 4 different movements for each and fewer reps....maybe 90-120 total reps for hams and the same or a bit more for calves, doing 10, 8, 8 or 12, 10, 8, 6 routine and increasing the resistance while decreasing the number of reps. Total workout time 30-45 minutes. Working out at a gym that has a fair variety of equipment which keeps it interesting.