How long do DIY ceramic coatings actually last?

Across the specialist detailing communities we read, real-world durability tends to undercut label claims. Spray-on 'ceramic sealants' typically deliver 6–12 months of strong hydrophobic performance; consumer glass-bottle coatings like CarPro CQUARTZ UK 3.0 are commonly cited at 12–24 months on a daily driver; and longer-life products like Gyeon MOHS are cited at roughly 2–3 years with proper maintenance washes. '9+ year' and '10+ year' claims are widely disputed in enthusiast threads.