How often should sunscreen generally be reapplied?

Sunscreen should generally be reapplied every two hours to ensure maximum effectiveness in protecting the skin from harmful UV radiation. This recommendation is based on the fact that sunscreen can wear off due to various factors, including sweating, swimming, and even towel drying. Additionally, environmental factors like wind and sunlight can diminish the protective barrier provided by the sunscreen. Reapplying every two hours helps maintain consistent protection, especially during outdoor activities or prolonged sun exposure.

While some situations might require more frequent reapplication, such as heavy sweating or water activities, the two-hour guideline is a standard practice for most scenarios. This approach balances skin protection while ensuring that the application of sunscreen is practical and manageable for users.