Rest time between sets is best determined with a goal in mind. When using light weights, say 50% or less of maximum, and working on speed or for warm ups then between 1–3 minutes. However, when using weights above 50% to limit strength reps 3 minutes between sets allows for ATP to replenish. Between maximum attempts even longer rests are necessary for optimum output. In competitions we have about 10 minutes between attempts. Muscle recovery is essential. ATP and glycogen need a chance. For endurance strength the formula is different. Thanks for getting back to me.