How long does it take someone to out grow a bike ?
Having the right tool for the job at hand is the important part.I would say that you outgrow/move up bikes, when and if the bike no longer does what you "need" it to. I first got a Honda twinstar 200cc, thought I would only want to ride around town. Didn't take long for me to want to upgrade. I wanted to get out on the highway, ride to work, take a motorcycle vacation!! The Honda 200cc is a great little bike, I still have it, but it cant do what I
"need" it to.