1. Know what triggers a review
Deposits almost always credit fast. Withdrawals can sit in a review queue depending on a handful of triggers that most operators don't publish explicitly. The four most common: cumulative withdrawal size past an internal threshold; first withdrawal to a new address; pattern that looks like bonus abuse (deposit, immediate withdrawal at close to zero wagering); VPN or proxy detection.
If none of those are true, your withdrawal processes automatically in the minutes-to-hour range on most operators. If one or more triggers fire, expect a 24-48 hour manual review plus possible document requests.