Pull-ups on the minute

Coach’s notes:  For this workout you complete set a 1 minute timer.  In the first minute you must complete 1 pull-up (easy right?).  At the start of the second minute you have one minute to complete 2 pull-ups.  At the start of the third minute you have one minute to complete 3 pull-ups.  Continue in this fashion until you are unable to complete the required number of pull-ups within the minute.  Anything over ten minutes is pretty good for this workout.  Every minute after 10 becomes exponentially harder.  Post the number of minutes you were able make to comments.