For pure BB'ing you would want a faster pace, with consideration to TUT (time under tension). Also to encourage the pump. If doing the extremes, like SS's, Tri set/s, Pre-exhause, Giant sets than no rest between grouping of exercises. And than maybe 60 tp 90 seconds between those SS's, Tri sets, etc, etc,etc before starting another group set.. Some misguided folk with take anywhere from 15 seconds to 30 seconds between sets but that is on the edge of marathon training. Usually for short burst of training while cutting down. But you will lose muscle mass in the long run. Maybe why so many local show BB'ers look like skinned rabbits
But not too many people do that type of intense training in the real gym world. So as a general rule when using moderate weight and workouts (as most guy's do) than 90 to 120 seconds is usually the rule of thumb to hold that pump. Even on the compound exercises. A few of my chunky PL'ing friends will take 15, all the way up to 30 minutes, between benches, squats & DL's.
If you take more than 3 minutes max between sets than your just stroking it. Or your really not in true shape anyway. Want to keep a fairly good pace the whole workout, from start to finish. Good Luck.