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SPF stands for Sun Protection Factor. To figure out how long you are safe from the sun (at least the UVB rays) you need to do a little math. Take the number of SPF and multiply it by 10. That is the time that if you were under perfect conditions, you'd be safe from the sun's rays.
SPF是防晒系数的意思。需要通过一定的计算才能知道你在太阳下可以待多久而不被晒伤(至少不被UVB射线晒伤)。将SPF系数乘以10得出来的时间是你在涂防晒产品的情况下的保护时间。
For example: SPF 20 x 10 = 200 minutes of sun protection
例如：SPF20的防晒产品可以可保护你达200分钟之久。
Perfect conditions mean that you aren't in water or sweating, two things that usually go hand in hand with the sun. This also doesn't reflect sunscreen that can rub off from your clothing.
理想的条件意味着你不是在水里或出汗。而这两个事情通常和阳光密切联系在一起。但这也并不反应防晒霜会被你的衣服所擦掉。
Because you want to be safe from the sun, I'd recommend applying every 1-2 hours, no matter the SPF.
因为你想防晒，所以我推荐不管防晒系数是多少，每隔两个小时涂一次。
