I usually make it in under 15 when just ambling along...I have long legs so tend to walk quickly. I did make it from the International Gateway to DHS turnstile once in under 18 mins, with a stop in my room at BWV!!! I was cranking. But had to get to DHS to see Osborne Lights before the park closed that night and had just watched IllumiNations!! Not such good planning on my part!
I will take the boat if it's there or coming in. I refuse to stand and wait for the boat to get there...could be up to 15 mins or so, depending on how many boats they have in service. Then, it's about 20 mins from BW to DHS on the boat. If it's really hot or humid and I don't want to walk, I take the boat. But that doesn't happen often. It's just so much easier to walk it!