Thomas, from your post I am assuming you are talking about recovery time between sets. Well, that's going to vary, based on your loading parameters: i.e % 1 RM, , reps, etc. It boils down to how much time it will take for your CNS (central nervous system" to recover. In many texts I have read, there is a basic guide, but keep in mind, they do vary by individual.
For weights in the 70% 1 RM, with reps over 10, 60 sec or less should work. For weights around 75% ! RM, 8-10 reps should work, with around 69-90 sec rest. For 6-8 reps, with around 80 % 1 RM, 2-3 mins should work: and with absolute strength in mind, 85% 1 RM and up, 1-5 reps, try 3-5 minutes. Kweep in mind, it's just a general guide, and you wil have to adjust according to your own responses, adaptations.