Your cat likes me more
In brightest day / In blackest night / No evil shall escape my sight / Let those who worship evil's might / Beware my power--Green Lantern's light!
It has taken us 2.5-3 hours to play a quest each time we’ve played.
Total shot in the dark here... but are you using all the cards from a particular quest? The three dungeon decks should have 11, 12, and 13 cards each; with 10 monsters in each and respectively 1, 2, or 3 keys.
It seems unlikely to me that you'd be doing that, but I don't know what else it could be.