Depends on what your goal is....
1-5 build strength
8-12 build hypertrophy
15+ build endurance
Sets going for 30sec-2min are glycolitic
Sets going for 3+min are oxidative
Lactic Acid rounds are around 1-2min for GH release
So you can do:
Small reps with plenty rest for strength
Small-Moderate reps of several compounded movements back to back for more glycolitic/GH training
High reps of bodyweight or low weight for oxidative
Or mix it all up in one workout like a 21-15-9 format
Not hard to do......Just change the focus day to day.