My fiance picked it up after a few years of us being together. Though I think she’s just one of those people who pick up traits easily. She had a very noticeable US east coast accent, then we moved to the mid west. She dropped the “A” then she picked up the “O” lol. Now she’s out of the service industry and dropped the Midwest accent. I’ve had friends that picked up the stutter then very quickly dropped it.