any WWII runways left dorment ?
Dad was a Marine. He was in the second wave that landed on guadlecanal in the Solomons. The marines were volunteered to help regrade Henderson field with the navy Seabees. They used japanese bulldozers and graders. Not happy doing that by the way, being a marine
To answer you... on jungle strips the jungle would quickly reclaim it. On desert strips probably a better chance of it still being there, but also more likely to be a known commodity.