Butylated hydroxytoluene (BHT), also known as dibutylhydroxytoluene, is a lipophilic organic compound, chemically a derivative of phenol, that is useful for its antioxidant properties. European and U.S. regulations allow small amounts to be used as a food additive.
Like others have said, it depends... If you're doing sets of 8-12 reps with moderate weights, rest 60-90 seconds. if you're doing high weight low rep (3-5 reps), then rest 2 minutes And if you're doing real heavy stuff like squats, deadlifts, I'd recommend at least 3 minutes.
Do pyramid sets. Get the weight heavy enough to do a maximum of 15-20 reps. Then, do pyramid sets with the weights, doing a set of 5, then 1 set of 10, 1 set of 15, before working your way down again. Rest between your sets for 30 seconds to a minute. After the minute of rest between sets, do another pyramid set that trains the same muscle groups with the same amount of reps and rest.