I walk relatively slowly compared to most people, despite being moderately fit, and I can still get from YC to HS in 20 min max. And that's with stopping multiple times to remind DS (5) to catch up, not climb on walls, etc. etc. If we walk with purpose and DS is in a stroller, we can cut it down to 15 min or less. Epcot is closer but even with our meandering pace we can get to the IG in 10 min at the most.