Hmm, sci-fi is a good keyword. Given that they have advanced technology and given it's just a gene therapy, I'd say at least one week before the changes are fully permanent. It's a change on the genetical and molecular level after all...<br/><br/>If they've got a magic machine or something (nanobots or something akin to microbes maybe) then it could happen nearly instantaneous or within a few hours...<br/><br/>And yeah, I was thinking of the shock factor of the revelation there, wolfy, so that might be an idea I would pursue. However, some players have expressed a dislike for bestiality, so unless there is no one present who is opposed to it, I'd say no to it. (although that doesn't mean it can't happen before already  ;) )