There are many variants of the terminology 'instant payout'. Each casino thus has its own interpretation of the term 'instant'. That goes from 'same day withdrawals including weekends' to 'Instant withdrawals with ewallets' to 'maximum 24-hours pending period', etc.
There is no doubt: the ideal and fastest way to deposit and cash out money from and to your casino account are ewallets. If you are looking for hassle-free and speedy cashouts, then use them (i.e. Paypal, Neteller, Skrill, PaySafe, etc.).
Credit card withdrawls are a good speedy alternative but not all creditcard companies allow to withdraw funds back to your card. Wire transfers take always 2-5 working days at least.
Our advice: choose an instant payout casino.