It's taken me days before >_> (Not playing 24/7, but still, a lot of time!) But it doesn't usually take me as long anymore, since I've spread PWPs around town for house-repelling purposes.
All of my resets have taken under half an hour, except for Fauna. She took me like 6 hours. It was so awful -.-
And in the end it wasn't even the spot I wanted. I was fed up so I decided it was good enough. XD
I took around 1.5hr for Poppy's house and only half an hour (lol) for Colton's. That's why I was wondering if certain villagers are more "obedient" in house plotting.
Must admit that I've been quite lucky with plot resets... the most I've resetted is 3 goes. My most recent 2 move ins haven't needed a reset at all - they've just moved into the exact spot where the last villager moved out. It could be that I've spread my PWPs around and they have less options of where to move.