Hypertrophy is more like strength training than endurance training. You are more likely to see strength gains than endurance gains when training for size. But, optimally, you don’t want to take super long rest breaks. Just rest enough so that you can do the next set without sacrificing your form and while keeping your rep count in the ideal range. So say you do 10 reps the first set of an exercise. You don’t necessarily have to do 10 the next set. 6 or 8 will be fine, as long as those reps are clean. 6 good reps is better than 10 half assed reps.