If you were a hiring manager and saw a gap in someone's resume between the last job they had and now, when would a gap start to be a concern for you?

Concerning just meaning you would think "hmm, I definitely have to ask them about this"

6-12 months
A year or two
Three or four years
Five plus years
Select gender and age to cast your vote:
If you were a hiring manager and saw a gap in someone's resume between the last job they had and now, when would a gap start to be a concern for you?
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