PGE-1 injections have been used in chem-pe for a long time with the same goal (priapism) but I have not heard of a PE practitioner having results as dramatic as those quoted. It’s been a while since I’ve followed anyone’s chem-pe adventures, but as far as I remember this particular approach usually isn’t overly successful. Then again, 5 hours is a long time - I’m not sure I’ve seen anyone go for that much before.