Landscape and residential turf warranties typically run 8 to 15 years, and a few brands market a limited-lifetime warranty. Sports-field turf warranties usually run 8 to 12 years, with a couple of lifetime options on specific lines. The catch is the same across nearly all of them: they are prorated (the payout shrinks as the turf ages) and material-only (they do not cover the labor to tear out and reinstall).
So the length is the headline, not the story. What matters is the proration schedule, whether the warranty is insured, and what voids it. This page lays all three out, with sources.