Do I stay or do I go?

You are sent to a long-term health care facility to interpret a 2 hour therapy session.  The session is over an hour into your gig.  Yeah, free to go!  But the Deaf client says, "I need you to interpret something else for me."  You follow him back to his hospital room where he just wants to chat with you.  He knows you have another hour your getting paid for--he said as much--and invites you to stay that hour with him.

--on one hand, you are getting paid, why not stay?
--on the other hand, you are getting paid to interpret, not to chat.  Why stay?
--the thing is, he doesn't have anyone to talk with and he is an interesting person.  Why not stay?
--but, its not your job to chat with clients; its your job to interpret.