You should've cashed out in little amounts (but then you couldve gotten banned)
Yes, they usually take this long. Fj has a relatively small wallet, nearing 150 BTC. If you happen to win more than half of that, it'll be a huge hit against them. They're either trying to find an excuse or quadruple checking the leitimacy of your bets.
Did you win through skill, or luck?
I like to say skill sometimes, because I bet on colors that haven't come up in a while, or I'll bet evens when there have been a few odds in a row, and I'll bet on 3rds when the set of 12 hasn't been called in a while.
In all honesty, though, I'd be a fool if I thought it wasn't complete luck. Each game has the same chance of landing 1-36 or 0, so there is no real "skill" in it.
As long as I remember that it's all luck, I tend to cash out while I'm ahead. I make crazy high risk bets, but only when I know I can afford to lose them.
This time I just got insanely lucky. I really hope they deposit soon. I'm just really eager now.