On the other hand, the guy who switches because he's interested in harder problems might not take the same amount of time to train up. At my last company my bo

On the other hand, the guy who switches because he's interested in harder problems might not take the same amount of time to train up. At my last company my boss hired me with the intention of me taking a year to learn the business (it was an entirely new industry for me). I was running a part of a new team 3 months later. After a year he left, and brought me with him to a new company. If you ask him I was a pretty successful hire. If you look at my resume, and ask... why only a year? You might think I am unreliable.