My friend and I were going to take the boat from the Intl Gateway to DHS last Dec. As we approached the boat, they were just closing the doors and starting to take off the lines. They told us another boat would be along in about 15 mins. Nope, we told them...we'll walk and beat you to DHS. Not going to happen they laughingly responded. Well, we reached the BW dock area about 30 seconds after the boat did. We cut through the BW area, past the Village Green and the pool area, and out to the sidewalk out back that runs along the canal to DHS. We have a pretty normal walking pace. The boat was nowhere to be seen as we walked along. We got to DHS, started crossing the area beside the parking lot, and started moving towards the bag check area, with the canal to our right. We could see the boat coming, just around the bend. It was about 4 mins from docking. By the time the boat would get there, we would be inside the park, heading towards ToT!! It takes the boat 25 mins to make the Epcot to DHS loop. It took us about 20 mins to walk it.
I have actually made it in 18 mins, with a stop for a sweatshirt in my BW villa...but I was cranking.