Assuming a sharknapped character is more than happy to be affectionate and friendly with the shark, what kind of time scale are we looking at for them to be able to leave again?

Annnnd could the item in question be a magical pet, or is that probably a bit too much? (In which case I'll keep saving spoons, ROFL)

EDIT: Whoops! Also, if someone has been sharknapped, can they still communicate with friends via relic?