Casino nowadays should really be having that standard instant withdrawal.If there are some hold ups and pendings then it would be varying into some
issues which is likely on this case.
Only few casinos have that feature of instant withdrawal and even at that it is not a guarantee for the transaction to be instant 100% all the time, since some time network congestion and other blockchain related delay may occur but at the most withdrawal shouldn't exceed few hours and if it go beyond 24 hours then it should be reported because some casino can deliberately delay withdraw processing due to their own internal errors.
*But most reputable casinos already have an established system that process transaction ASAP.
Only casinos that have slightly bad service have long withdrawal transaction times because after all, reputable and well-known casinos will always guarantee that every transaction can be processed and succeeded very quickly, even it only takes a few minutes.
Because the process of withdrawing or depositing transactions is the main factor that every gambler really needs, so it is impossible for an established and well-known casino to process a withdrawal that takes quite a long time or even a delay because it can damage the reputation and trust of every gambler.
Maybe if something takes a little longer it can happen if the withdrawal is made in a large enough amount and there are many transactions simultaneously, but it only takes about 1-2 hours at the most.