[quote=Aerandir]
I am sensing a great ally or a great rival.Question how long was he in the rangers?
[/quote]

He went into the military when he became an adult, which would be the age of 18 (an assumption). Given that he's a natural sneak, and just needed to be tuned up be the Rangers for range-combat, I'm going to say his apprenticeship took two years. Making his time served as a Ranger four years.