How far does an average mountain biker ride in any given day?

I'm in the military stationed in Germany. I've recently started taking up mountain biking, mainly on the weekends. Germany is blessed with bike trails in which I use. Usually I log in between 15 to 20 maybe 25 miles in one day. Question is, in relation to someone who goes on a biking like I do (not the touring bike), someone who does it just as a hobby, not a profession do I pretty much ride the same distance as they do?