The effects of Botox generally last 3 to 4 months, though individual longevity can vary based on metabolism, dosage

https://www.scribd.com/document/972717321/When-to-Call-Your-Provider-After-Botox-Safety-Signals-171403

The effects of Botox generally last 3 to 4 months, though individual longevity can vary based on metabolism, dosage, and treatment area.