I'm kind of stuck on 10,000+ miles as being "high mileage" because that is what traditionally gets recognition from my club. The 10,000 milers I know who work full time generally ride to and from the weekend club rides, turning a 60 mile ride into 80 or 100 or more. Although winter isn't much fun, here in TN we can ride some each month, no 3 or 4 months off like other places. I can see how folks in MN or ND might be tempted to count indoor "miles."