Quoting Your friendly n00berhood :" I have not been in an abusive relationship, but I would assume that it would take the same amount of time as a "normal" relationship. The time varying by person."
It doesn't take the same amount of time as a normal relationship. By the time they leave, you are just SO emotionally drained and attached to them that you can't even imagine living without them and you go back and forth between being happy you're finally free and wishing they just loved you like they said they did and wishing they would just TALK to you. It's a long process to get over that emotional roller coaster and I certainly didn't have to deal with that in any of my other relationships.