Depends on you and how much you want to do. Are you going to be seeing the characters there? Doing Agent P missions? Those can take some chunks of time. We usually get there at rope drop move to WS by 11:00 or 12:00, go to a TS meal and then stay there until closing. DD wants to see all the characters and do all the agent P missions, so that usually is not even enough time for us. EPCOT is a 2 day park for us. If you aren't doing characters or agent P, and don't care about watching any of the entertainers, to just walk it, shop or explore a little in each country, ride the 2 rides, see the movies and maybe have a drink or snack, I agree with the PP, it will probably take 5 or 6 hours. To put the size in perspective, to walk from one end of WS to the other end is almost a mile.