The correct answer is false. The sun protection factor (spf) describes how long a product will protect your skin, if you apply the sunscreen correctly. Fair-skinned people begin to burn in about 15 minutes on a sunny day, so wearing an spf 15 sunscreen (if applied and reapplied properly) would prevent sunburn for about 225 minutes (15 spf x 15 minutes until sun burn= 225), or 3 hours and 45 minutes. The spf 30 sunscreen should last for 450 minutes (30 x 15 = 450), or 7 hours and 30 minutes. In practical use, you'll need to reapply sunscreen every 2 hours. be sure to choose a broad spectrum product that blocks uvb and uva light and use a lot.
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