I ride on average about 15 hours a week but I had many years where I rode a whoooole lot more than that so I have averaged it out to 20 hours a week.
Its been around 25 years that I have been riding and I had 3 years off in there somewhere. So I will make my years 22.
1 year = 1040 hours
22 years = 22880 hours (wow that's a lot of hours lol) I know its only a very rough guess but its probably ball park