My commute is 20mi r/t and on the weekends I'll go for a couple of 30-40 milers with friends if I ride both days. I might do a 100k if I'm just riding 1 day.
When I was at peak form last year, I'd ride 150 miles of commuting during the week (30mi/day, 5 days) and then go and do a 200k or 300k on every other (or third) weekend for about 4 months. But I burned out pretty quick on that schedule and ended up injuring myself by the end of the season.
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"I feel like my world was classier before I found cyclocross."
- Mandi M.