How long should an electric razor last before I replace the blades?

Manufacturer guidance and specialist sites like Shavercheck broadly agree on roughly 12–18 months per foil/cutter set for daily users, though r/BuyItForLife threads include Philips Norelco owners reporting 5–10 years on original blades with lighter use. Replacement-head availability is a real differentiator — Braun and Philips score well here; off-brand units often don't.