This would depend on the amount. Some online casinos have a withdrawal limit. And, will only allow withdrawals of a certain amount of credit won using bonuses. Some casinos are offering instant payments – up to 10 minutes – others are subject to the terms, conditions and timeframes. IF you only have free bonus credit in your account for example, you wont be able to withdraw. It would also depend on the payment method, such as PayPal or e-wallets.