Some of my friends make it a priority to switch jobs every 2-3 years, they think that's the fastest way to get ahead. I don't necessarily agree or disagree with that, but if that's one's priority, one would practice interviewing so one can ace the "real" interviews when it's time.
I switch jobs every 2-3 years, historically. Not because I inherently want to, but because that has historically been when I'm ready for a new challenge. But when I start interviewing, it's with a lot of intent to move, if the situation is right.
