Although making online casino deposits with a Mastercard casino is instant, withdrawals may take longer. The best casinos process casino Mastercard withdrawals within 1-3 days, but it can take up to 10 days for the funds to appear in your account. Again, ensure that you are within the withdrawal limit. Monitor your winnings and be accurate in calculating what you should receive. Ultimately, most casinos want to keep their users happy, therefore, payments tend to appear as quickly as possible. If your payment is taking too long in accordance with the online casino's promises, be sure to contact their customer service department.