I remember 2 dungeons who's time limit was really small.
In one of them the bosses needed some time to learn, and if you had 3 wipes, then you wouldn't be able to end the dungeon anymore. (the dung was 40ish, dont remember exact lvl nor name)
the other dung, was the manor, if you were in a party with everyone at minimum lvl, then with just a single wipe, you could end up not being able to beat it. (but if everyone was at its max lvl, you had more then enough time for even 2 wipes)
My first time in the manor, my party beat it, but we noticed we still had 1 extra key with us..so we went to find out the missing place and we barely made it in time. And we only got wiped once.