Why are deposits instant but withdrawals take days?

A deposit is an authorisation the casino wants to succeed, so it posts to your balance immediately. A withdrawal runs the other way and passes through a manual or semi-manual review, a payments queue, then the rail itself. Expect pending periods of 0 to 48 hours at most sites, often longer at weekends. After approval, e-wallets typically land within a few hours to one day, card payouts take 1 to 5 business days because they usually travel as a reversal against the original transaction, and bank transfers take 1 to 5 business days. Crypto is fastest once approved.