If you're getting more sucked into pump than you want you can always hold your balls until your old chap has grown a bit after a few pumps. I found key is not to rush, its not a race against the clock so ignore the 10 mins and just do however long feels comfortable whether that be five or thirty minutes. With practice, the pumping routine becomes second nature and you will pump by feel, not by 3 pumps wait a min, 3 pumps, etc.