I would highly recommend asking any other exchange, I believe Poloniex is about to sink as myself and many others on the forum are not able to withdraw due to bugs in their system.
It has been "only" 14 days for me, but for some it has been months.
There are bugs in the system facing some issues with the buy order placing, so we have to be careful with the poloniex. There are many complains about the exchange recently and they gradually decreasing the volume generating because they loose lot of faith.