Current general exercise guidelines for resistance training recommend a duration of:

$8-10$ repetitions of $10-14$ exercises targeting all major muscle groups

Upper body exercises for $6-8$ repetitions and lower body exercises for $10-12$ repetitions

$8-12$ repetitions of exercises for all muscle groups that are important to athlete's activities.

$8-12$ repetitions of $8-10$ exercises targeting all major muscle groups.