Single ply roof guarantees usually cover 15-20 years, but the actual service...

https://melissafreshmaid.com/tpo-vs-pvc-lifespan-what-matters-more-than-the-material/

Single ply roof guarantees usually cover 15-20 years, but the actual service life often stretches to 25-40 years. Guarantees focus on materials and workmanship, not wear and tear or maintenance