well, I'm an earlybird but I would be at the bustop at least 1 hour before your seating. This allows 15-20 minutes for the bus to arrive and 15-20 minutes to get there and still leaves you 30 minutes to get to the restaurant once you get to Epcot. That, I think should be plenty of time! Also, when you get there there is a special gate all the way to the left for early reservations for dining, there will be a sign there for it.