I would say they will be warm from 1 am till probably 5-6 am but I doubt 9, thats eight hrs. He could set his remote prob for a minimum of 150 degrees and stick it in one of them and set the reciever next to the bed, with the alarm on!
When that alarm does go off...roll over and boot his butt out of bed to pull those butts!! (me being a girly girl and all I am figuring you have cleaned your share of butt mess today??)
OMG this has been the greatest post!!