It is rare to get withdrawals from an online casino, no matter what banking option is being used. On average, a Skrill withdrawal should arrive within your Skrill account within 24 hours. Depending on how quickly the online casino processes your payout, this transaction time can be more or less - sometimes up to 72 hours. But the timescale depends on the online casino, not necessarily on Skrill - which tends to be one of the fastest payment processors online.