That should work. 10 seconds for me got the temp up to around 100, and then let it slowly cool to body temperature while it was in my boxers. Only tip I can say is, check the temp just before you are supposed to go in and piss, in the bathroom is the best bet, and make sure its sitting at a good temp. If it isnt, tell them you cant piss yet and ask for some water... and let your body warm it up some more before you go in.