10 years is the life of a VC fund, because that's the largest horizon that a wealthy investor is willing to part with his money even if it's not a large fractio

10 years is the life of a VC fund, because that's the largest horizon that a wealthy investor is willing to part with his money even if it's not a large fraction of his wealth. To ask almost the same (6-8 yr vesting period) to a worker that has a large fraction of his net worth in the startup seems utterly insane.