Someone else having trouble with poloniex withdrawals. All my other withdrawals took only couple minutes to process. Today my request is pending already for 5 hours.
Mostly withdrawal time depends on the cryptocurrency, you want to withdraw. Bitcoin for example can take several hours. ETH can take even several days. What currency did you withdraw? My experience, for example on Bitcoin, is, that, depending on how busy actually the network is, the transaction can take from a few minutes to several hours.