a better gauge to use is miles per year.

I would say that avid use (riding almost daily, 10 months out of the year) will usually figure to ~ 10,000+ miles per year on a bike.

Average use (6-8 months out of the year, riding 2-3 times a week) is probably 4,000-6,000 miles a year

Light use is anything under ~3,000 miles a year.