I remember FortuneJack took around 3 months to process someone's 0.50 btc withdrawals as they were investigating the win lol
I don't play on FortuneJack (or any bitcoin related gambling site) but this comment made me smile as fortune jack claims to be the best bitcoin gambling site on the web

.
On a side note, I don't understand why sites would ask KYC after winning a big amount. The strenght of bitcoin gambling sites if the anonymity that you have compared to "regular" gambling sites such as unibet, bwin or pinnacle.