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The SPF rating of sunscreen indicates the duration of protection against ultraviolet rays. Since SPF 1 provides protection for approximately 20 minutes, SPF 20 is calculated to block UV rays for 6 hours and 40 minutes. However, the effectiveness of sunscreen may decrease due to sweat or oil. Reapplying it every 3 hours, or at least once a day, allows for effective UV protection.
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