As many minutes as possible:
1st min.: as many squats as possible (up to 60)
2nd min.: finish remaining 60 reps with pull-ups
3rd min.: as many squats (up to 60)
4th min.: finish remaining 60 with push-ups
5th: squats
6th:pull-ups
Etc etc..

Basically have 2min to get 60 reps in of which the first min is as many squats as possible and then finish with either pull-ups or push-ups... alternating between the two. If you can't finish 60 reps in the two minutes then you are done.

25min + 50 pull-ups