Originally Posted by
rando
wow, you guys are hard core! see, I'm not sure I would do more than about an hour. I do about 40 min as it is. on the other hand, once you're at an hour, what's another half hour, etc., etc.,
The remaining bit of free time I have

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I say about an hour I'd give it up because at that point winter commuting gets really really tough. Somewhere around a 10-12 mile one way trip the winter ride, on bad days, becomes more than I want to think about.