Transfer speeds have improved over the last couple of years and money paid back to your debit card might be there in just a few hours. The second is a big factor and it is the chosen method. Casinos often mention how long the processing time can be in their terms. This step can vary from 1 minute to 3 days.
If there is no foul play, they accept it and put the request through.
The first thing that happens when you make a withdrawal request is that the casino staff will check the request. There are three big factors in play, account verification, the casino staff and the transfer method.