a few days ago cryptopia had deposit and withdraw problems, thus making withdrawal and deposit transactions into delay for a long time, if the transaction in cryptopia still seems slow, maybe you can use another exchange that is coinexchange.io
Actually, the issue was with Cryptopia's Denarius wallet. The exchange guys were not syncing the wallet, and there was a 48-hour lag for Denarius deposits. Even I was concerned in the beginning, but I waited for sometime and the coins showed up in my Cryptopia account.