I've been trying to pull my coins off of poloniex for 5 days now. I'm beginning to suspect that they have possibly been hacked for a large portion of coins and they are trying to stall to recover coins thru fees. There is no reason for these excessive wait times unless Poloniex is literally 2 guys in Florida running this op from a basement. I personally will not be using their service after this and I would advise new users to consider alternative exchanges. Here is a long list of former exchanges going belly up
https://bravenewcoin.com/news/36-bitcoin-exchanges-that-are-no-longer-with-us/