Why 4 hours?.
I mean are there men out there who normally go more than 3 hours? Cuz I have been with my fair share, and I haven't seen that yet.
.
When I was younger (like 16) I go do it 3 or 4 times in 4 hours.
.
Age catches up, I can do it 3 or 4 times in 3 or 4 days now. Okay, not really, but 3 times in 4 days is possible.
.
I would start to worry at about hour 2. Then I go to sit on a couch with a woody for 2 more hours until I go to see a doctor. And that 2 hours is going to put you beyond the bed-time for your doctor. I mean after 4 hours, unless you getting the early bird special, it is emergency room time.
.
Just a random thought.