Incheon Walk 3, Day 4: stats

Why does the Day 4 segment always seem shorter than the Day 1 segment? They're the same length, at least in theory. I did do a revolutionary thing, today, and walk almost straight back to my place after taking only a single thirty-minute break around 9 a.m. (I was out the door by 6). It was brutal on my feet (which are currently screaming), but I made it back to my apartment by a little after 2 p.m.