I was thinking about this today, following a conversation with Hutchman Dave! On an average week I probably ride a BMX for about a total of 2 hours. Sometimes more, sometimes less, but let's stick with that. Plus I normally take in a track visit once a month, so I'd say my monthly riding time is, for the sake of easy maths, 10 hours.
I check out here and the BMX Museum every day, so that's about an hour a day, 7 a week and say, 30 a month. Plus there's checking out parts on online auctions, say 2 hrs/week, 8 a month.
Plus a bit of spannerwork. Not every week, so let's say 2 hours a month.
By my rough and ready calculations, 10 + 30 + 8 + 2 = 50 hours/month, on average. So is that about the norm for an average Radster??