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Usually, partial-thickness burns heal in 10 days to 2 weeks. Large burns may take 3 to 4 weeks to heal. There may be little or no scarring if the burn was not too extensive and if infection is prevented. Do remember that blistering sunburns can cause skin cancer (melanoma) later in life.
It quantifies the amount of time you can be in the sun wearing sunscreen before you are burned. So if you are fair-skinned and would begin to burn in ten minutes without sun protection, wearing an SPF of 15 will protect you fifteen times as long - for 150 minutes (10 x 15 = 150). SPF math is also deceptive because the numbers don't add up. SPF 30 does not double the protection of SPF 15, for example. It would figure that you should be able to stay in the sun thirty times longer, but that's not the case. An SPF 15 allegedly blocks 93 to 95 percent of UVB rays, while an SPF 30 supplies 97 percent coverage.