Humblebrag? Almost 100% of humans are incapable of doing a four hour 100km bike ride without a lot of prep and training. Nevermind doing this daily.
And one doesn't have to do 100km all at once. A 10km commute each way over a 5 day workweek is a much less intimidating prospect.
Now I live in America need a car :(
> Now I live in America need a car :(
Why? Are there even longer distances?
I was doing it on a roadbike and could comfortably average 27km which got me there 3h. Driving was about 1.2h.
In the summer, I would start pedalling at 5am and get to a local cafe at 8. The first hour was amazing, broad daylight and you basically had the whole road network to myself.
Yeah, unfortunately, for me, even after some training, it's still hard for me to average over 22 km/h (entire travel including stops; the moving average is about 25km/h, e.g. https://www.strava.com/activities/9688833121).
It could depend on how you define "almost 100%" of course. There's a big difference between 5% and 0.001%.
NB nobody would be able to do this without ingesting a substantial amount of food during. If you didn't start eating hourly after about 1-2 hours in, you'll "bonk" or run out of glycogen.
After a few years of regular (monthly) 200km rides I could do a 200km ride (~10h elapsed) without eating anything on the way round.
Cycling at 15mph on flat ground is pretty easy. If you can do that for an hour, and can progress at 10% increase in riding time week over week (pretty reasonable for someone who is still gaining fitness from "nothing"), you'll be doing four hour rides after just 16 weeks.
that said, ok, 15mph is not that easy -- maybe starting more like 10mph on a road bike for an hour would be more reasonable.
I still think most able bodied people could get to OP's fitness in much less than a year.
One data point - I was horribly out of shape in my mid 20s and got to riding 4 hour/15mph about four months after I bought my bike. But I was also unemployed for about a month of that!