Chin-ups, sets to failure, set + rest = 4 minutes, 12 sets: 5 - 4 - 4 - 4 - 3 - 4 - 3 - 3 - 3 - 3 - 3 - 3. So 42 in total.
Some of those 3s almost felt like they could have been 4, but then the subsequent 3 would probably have been a 2.
Chin-ups, sets to failure, set + rest = 4 minutes, 12 sets: 5 - 4 - 4 - 4 - 3 - 4 - 3 - 3 - 3 - 3 - 3 - 3. So 42 in total.
Some of those 3s almost felt like they could have been 4, but then the subsequent 3 would probably have been a 2.