Bitcoin: ~60 minutes (6 confirmations required)
Bitcoin Cash (BCH) : ~600 minutes (20 confirmations required; note that block times are currently inconsistent so it may take longer or shorter than this estimate)
Litecoin: ~30 minutes (12 confirmations required)
Dogecoin: ~20 minutes (20 confirmations required)
Namecoin: ~60 minutes (6 confirmations required)
Ripple (XRP): Transactions are immediate
Lumen (XLM) : Transactions are immediate
Ether (ETH) : ~6 minutes (30 confirmations required)
Ether Classic (ETC) : ~24 minutes (120 confirmations required)
Augur (REP) : ~6 minutes (30 confirmations required)
Iconomi (ICN) : ~6 minutes (30 confirmations required)
Zcash (ZEC) : ~60 minutes (24 confirmations required)
Tether (USDT) : ~60 minutes (6 confirmations required)
Dash (DASH) : ~15 minutes (6 confirmations required)
Gnosis (GNO) : ~6 minutes (30 confirmations required)
Monero (XMR) : ~30 minutes (15 confirmations required)
Melon (MLN) : ~6 minutes (30 confirmations required)
EOS (EOS) : ~6 minutes (30 confirmations required)