For one thing, they didn't include a fee. That will slow it down a bit.
Yep. No transaction fee. If you are lucky, it could confirm in the next block. If you are unlucky, it might take a few days for it to confirm. If you are really unlucky, all the peers and miners will drop the transaction from their memory in a few days and it will never confirm.
You should probably contact support for the poker site and explain to them that they failed to include a transaction fee, and that they should fix this problem for the future.