Fortunately, we can look to longitudinal training studies that actually measure muscle hypertrophy for answers. It just so happens that my lab carried out a study that sheds light on this very topic. We recruited 17 resistance-trained men and randomized them to perform either a bodybuilding-type (3 sets of 10 reps) or powerlifting-type (7 sets of 3 reps) routine. The per-set TUT for the bodybuilding-type routine was about 30-40 seconds while that of the powerlifting routine was around 9-12 seconds. Training was carried out 3 days a week for 8 weeks.