A little more than [the customary] six months, but not much.
I think that means he was not acqui-hired. He didn't work for Google after the sale. He just took his money and moved on. Lots of employees of acquired companies don't join their acquirer for one reason or another. I suppose that can work for founders too. I've read of a few founders that were disappointed once they were acqui-hired because they lost control of something they had built... but still have to work on it.
It's hard for me to undertsand if that's what happened here: "After selling map-software provider Waze to Google for $1.1 billion last June, the 49-year-old Israeli decided not to join the ranks of his famous acquirer." that would seem to read like he never went over at all.