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AhaBulb: Stuff Everyone Should Know · ahabulb.com/spf-not-hours

Does SPF 30 mean you can stay in the sun 30 times longer?

No. SPF measures sunburn protection, not hours.

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  1. Yes, 30 times longer
  2. Yes, if you put it on before going out
  3. No, it is not a timer ✔

Why: FDA says SPF is about how much sun it takes to burn, not clock time. Midday sun is stronger, so the same SPF does not buy a set number of hours.

Huh, didn't know that: Pick broad spectrum SPF 15 or higher, and still reapply.

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Why did the tomato turn red? It saw the salad dressing.
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References

Answer: No, it is not a timer. FDA says SPF is about how much sun it takes to burn, not clock time. Midday sun is stronger, so the same SPF does not buy a set number of hours.

  1. FDA: Sunscreen and Sun Protection www.fda.gov/drugs/understanding-over-counter-medicines/sunscreen-how-help-protect-your-skin-sun
    This is not true because SPF is not directly related to time of solar exposure but to amount of solar exposure.
    Checked 2026-10-09.

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