Altcoin confirmations and safety - wait ~6 confirmations, or ~1 hour?
See https://bitcoil.co.il/Doublespend.pdf. What matters is the number of blocks, not time elapsed or average time for this many blocks.

Also, the idea of "wait for 6 confirmations or 1 hour" in Bitcoin is a myth. If 1 hour passes with 3 confirmations you're less secure than if 30 minutes passed with 3 confirmations, because the attacker would have had more time to build his competing branch.