How long did Noble Six survive for?

How long did Noble Six survive for? Noble Six was finally pinned to the ground and killed by a group of high-ranking Sangheili. His helmet, which had been dropped shortly before his death, was left in the glassed wasteland and remained alone there for 37 years, by which time the surrounding area had been re-terraformed.

Noble Six was finally pinned to the ground and killed by a group of high-ranking Sangheili. His helmet, which had been dropped shortly before his death, was left in the glassed wasteland and remained alone there for 37 years, by which time the surrounding area had been re-terraformed.