Oberon and Fey would be my longest. Started with Oberon, Fey, and Sprite in... omg Jan/Feb 2007.:shock: Oberon was terrified of them. Got well along in bonding when Sprite passed away September 2007. Intensified bonding, moved in with Fey a few weeks later... few weeks after that horrible fight and they were separated. Took things very slow and they moved in together for good last fall. November maybe?
To help Oberon get over his fear of the girls (and utter inability to relate to them), we did "forced cuddling." Held Oberon and one or both girls on my lap together with my hubby helping, petting and praising them. After a month or so Oberon started to willingly snuggle into them. Then bathtub bonding for several months. He and Fey had a few decent dates in the living room but Sprite was still working out dominance with Oberon.
When I made the big decision to put Oberon in Fey's pen overnight again this fall, I did it because A) As soon as I opened their doors they would always run to snuggle with each other and had been doing so for several weeks.
B)Fey was increasingly depressed without an all-day snuggle buddy. Playing less, eating less, and just needed some always-available love.
IMO, one really good sign that they can live together is when they can play in each others cages with no signs of concern from the bunny that lives there. Sometimes it takes a little time for a bun to get used to seeing another bunny pooping in his litterbox or eating his precious hay. Especially good is snuggling or grooming in each other's cage during playtime.