I rode a 5:03 last week, but had a flat and also stopped once for water. My ride time was 4:53. I was on very easy route with only 2000 feet of climbing and mostly good pavement.

The flat bothered me both physically and mentally, kind of felt like the ride was "screwed" after that. I've ridden several Centurys non-stop earlier this year but the heat is on now......