I have tested cryptopia on january 17th, took like 1.5 hours for the deposit to appear and 1.5hours for the withdraw to appear in my wallet. What exactly happens there now? Is their wallet unsynced ? Are the deposits delayed as well or just the withdrawals ? I have tried other coins, like btc, doge, ntrn, eth they all worked fine (eth was slow to accept deposits, took maybe 1hour). Is this delay only for BTX withdrawals? Go on their IRC webchat
http://webchat.freenode.net/?channels=cryptopia-ex&nick=typeyournickhere and write them support tickets, try to be short and to the point without cursing or blaming (I do it too and it never helps).
From what i noticed it looks like its on a 30 Min cron and processes the smallest transactions first and pushes large transaction down the line until their wallet can payout. It was a good system on lower volume and a larger hot wallet, but with BTX and everyone trying to pull the coins out, the hot wallet got tapped. So basically speaking BTX is mostly in peoples personal wallets, not exchanges. BTC/ETH and other coins are ussually day traded and sit on exchanges for a while so their wallet is always full enough to pay out. Thats maybe why they withheld for the airdrop, to get enough coins to pay off their pending transactions.