what needs to be clarified in this discussion of TUT is that the time spent is not submaximal effort time, the bar/weight is moving slow due to the load imposed and not because the lifter is holding back. this being the case, a 60 second set is usually out of the question and more an issue of muscular endurance rather than strength(though some decent poundages may be used) . if hypertrophy is the goal, white fibers must be forced on meaning that all out effort should be the thought process when lifting the load. ie, push/pull explosively, even if the weight moves very slowly. i believe trainees tend to lighten the load in an effort to reach the TUT goal but miss the fact that they are sandbagging for the sake of making numbers/time. total time under tension for a workout is generally low when speaking of maximal effort.
but since we are talking bodybuilding, fast reps, slow reps, light weights heavy weights are used, all to gain overall size of the muscle to stimulate all parts that can grow besides white fibers.