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Since I just registred on Bitfinex and am learning what they have to offer I found something on this subject:
Bitcoin deposits are credited after a minimum of 3 confirmations (about 30 minutes, sometimes longer)
Litecoin deposits are credited after a minimum of 6 confirmations (about 20 minutes, sometimes longer)
Monero deposits are credited after a minimum of 15 confirmations (about 40 minutes, sometimes longer)
Zcash deposits are credited after a minimum of 15 confirmations (about 60 minutes, sometimes longer)
Ether deposits are credited after a minimum of 100 confirmations (about 30 minutes, sometimes longer)
EtherClassic deposits are credited after a minimum of 150 confirmations (about 60 minutes, sometimes longer)
It seems they think Monero needs 5 times more confirmations then Bitcoin. What I still think is overkill. Wonder how this will change with time. What will be a year from now.
They are going by an approximate amount of time. So 5x2min blocks (Monero) equals 1x10min blocks (Bitcoin). There is some logic to this if one is concerned about orphan blocks.
Edit: The interesting part is the "sometimes longer" when one considers that in some cases people are waiting 24 hours or more for a first confirmation in Bitcoin.