Why is my p2pool deposit taking so long to confirm? 0 0

Coins that are generated must go through 100 confirmations before they are considered generated vs immature.  To protect you and ourselves from unforeseen blockchain events, we wait the recommended 101 confirmations before processing them.

For more information please see:

http://bitcoin.stackexchange.com/questions/20120/what-was-the-goal-of-creating-the-feature-of-immature-coins