Supposedly infinite. They said that they'd attempt repairing any chips before replacing the windshield, but there isn't a limit. Seemed like a no brainer considering we are entering rockchip season (winter).
I'm probably a chump, but I ended up buying the 7 year windshield protection package from the dealer. It was $1400, but they went down to $1000. More than insurance deductible, but will hopefully keep my insurance from creeping up.