Wow, I'm way less above-average (below-average?) than I thought! Average for my area is 16-17 minutes. Mine is ~15 minutes biking or driving, ~20 minutes walking. But that is literally from my front door to being seated at my desk, and I work on the 22nd floor.
I'm guessing this is based on zip code where people live... I'm curious what it would be if it were based on workplace zip codes, if that makes sense. Like, I live downtown, so obviously most people that live downtown probably also work downtown... but if we were looking at EVERYONE who WORKS downtown, I'm curious how far people are commuting in from.