I've never even asked in an interview and if they have more than 4 years on their resume I just assume they had a rough semester, or some other external factor.

I've never even asked in an interview and if they have more than 4 years on their resume I just assume they had a rough semester, or some other external factor. My wife took 8 years to finish her MS because she did it part time. Does that mean she doesn't know her stuff? That's very far from the truth.