How Long Should You Rest Between Sets?

Research is pretty clear that longer rest periods are superior to short rest periods. But you could argue your training lasts for five times longer if you use all that time to do more sets. So it's there's so many variables you can play around with that it's almost impossible to get the perfect answer. That's why we need personal trainers that i can tailor it to the needs of the individual, right? Yes, that's well said, too.