That's probably about how many times the wheels on my bike turned around today. From Hiroshima City, took Route 2 past Higashi-Hiroshima, turned off to Takehara (about 55 km), went back around the coast to Kure (back towards Hiroshima-- another 40 km or so). Caught the ferry home after JR telling me they don't allow large, unfoldable, uncovered bicycles on their trains.
Here's a map of my trip. Left at 12:30 lunch time, took some breaks along the way, arrived Kure at about 6:30 pm. So, 100 km in 6 hours is about what's doable for me on a bike with some hills, light load, small amount of wind, good weather.