If you are beginner, take as much time as you need between sets to avoid feeling dizzy or overly fatigued, especially during the first 3 weeks.
As your muscles develop and you advance, start to keep track of the time spent resting between sets.
Fallow these rules:
1. When exercising at lower intensity, rest about 1. to 2. minutes between sets
2. If you’re more advanced and already lifting heavier workloads, rest longer for 2. to 4. minutes between sets
3. If your goal is to increase muscle endurance – strength, then rest periods should be short: 30 to 60 second
4. When doing circuit training, your rest between exercises is usually kept to a minimum to maximize cardiovascular benefits by keeping your heart rate pumping at an elevated rate