That has never happened to me when i used to play there in past. All withdraw get pad within minutes but i think you are trying to withdraw some big amount of money which they may not have in their hot wallet to pay you. They put most of their money to cold wallet for security. If this is case you will get paid when they get enough new deposits to their hot wallet.
If like this they are going to do the withdraw then i think for big players this site is very bad because for each transaction they have to wait for 2 or more days for their winnings. so it is much better that you can look to directbet.eu site which is fast and accurate withdraw with no waiting.