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That explains why working for Google seems so common. Hmm interesting, that explains a lot about why former Google developers are shit employees.

because they were in a massive hiring spree at that time, if you hire 10s of thousands of people in a single year it's going to drive down your average tenure

s/average/median/g according to the linked source(cnbc)

When you have an average that low (or far away from the median) you by definition have a extremely large number of 1 year or lower tenures.

The floor is 0. You can't have a negative tenure at a company.

What I meant to point out is that Stackoverflow quotes the source CNBC wrong (primary source linked to by CNBC is no longer available). It is the median that is that low. The average might be higher or lower than that number.