Jean's quest, Erdyna's, Sebastian's. A couple others I'm forgetting right now.
When the quest closes, the characters on the mission are kicked out of the location and begin a journey of three or four turns before coming back to the mansion.
I was going to simply teleport them back home. Or send them off to a different, nearby, location. Instead, I have to wait for them to get back to the mansion in order to send them off again. Plus the dungeon ones like Jean's always end up costing me resources and slaves which I was planning to collect.