"It's also considered completely reasonable behavior to work at a company for 3-5 years, and then move onto the next one." I believe this is the norm outside t

"It's also considered completely reasonable behavior to work at a company for 3-5 years, and then move onto the next one." I believe this is the norm outside the Valley as well. I'm trying to find a blog post about how, after 3 years at the same job, the challenge diminishes and it makes more sense to switch (if management doesn't recognize the need for growth).