Unable to even guesstimate ... 53 years of riding. Over 3 years of travelling Australia in early / mid 70's clocked up over 200,000 km.
It was the one sure way of ensuing that the ex and her boyfriend could not get one brass razoo from me, because I spent the lot!
Even if I only rode 5,000 per year for 40 of the other 50 years of riding, means at minimum, another 200,000 km.
Just the one month of Jan, 2012 was another 12,800 Km on the ST, and another 36,000 km in the past 22 months (average of about 400 Km per week)