I'd say about half hour from gate to gate. The MGM gates are a short distance away from the path, and the EPCOT entrance is at the end of the path. We've done the walk and find it most appealing first thing in the morning, before heat and walking through parks. I'd say it's approx 15-20 mins to MGM, around 10 to EPCOT. It is excellent exercise, especially if you see a boat coming and you try to beat it (not too hard to do that)!