Coin transactions will show up in your account almost instantly, however they stay pending until they receive a certain number of confirmations. Transactions are included in blocks which are published on the network ledger or the “blockchain.” With each subsequent block that is found, the number of blocks deep your transaction is considered increases. To decrease the likelihood a transaction can be reversed by an attacker, a transaction is only considered confirmed after it’s a specific number of blocks deep. This can take differing amounts of time depending on the coin being transferred, different network factors, etc.