There is a lot of gambling site now are instant withdraw because as a player Im looking also for that. But now I don't they have some gambling site who have need more hours before payout sent almost gambling site now are instant withdrawal . Best example for that is Stake after requesting payout they sent it directly to your account instant no waiting needed.
It is always nice to get the withdrawals instantly when we raise the request for it. Most of the gambling sites process the request instantly. Sometime I see a delay of 1 or 2 Hours in withdrawal processing in few sites, which is acceptable.