Remy begins his last round of the day at 5:20 (Monday - Saturday). He does not appear on Sunday. I would suggest a reservation no later than 4:45 because you need to be seated when he visits your section of the restaurant. Once he's passed your table he will not return.
He's a highly sophisticated 6 inch audio-animatronic figure. Occasionally there may be technical problems and he will not appear so if you have young children, I would not mention Remy just in case he's unable to appear and let his appearance be a pleasant surprise.