Haha yeah time although bleading rear is more often a nightmare than the front. just make sure you dont snap the nipple,
one thing i have seen and couldnt believe was, a friend of mine bought himself a Techno and his rear brake stopped working after an hour out on his new toy, he took it round to me and we started having a look and couldnt get it bled, i removed the nipple and found someone had damaged the threds in the caliper that badly that they had to cut the taper off the nipple to catch on good threads lower down, then plugged it with silocone sealant which ofcourse perrished and drew air in.
Sorry little of topic there.