So, if it typically takes you 20 minutes to burn and you’re using an SPF 30 sunscreen, you can expect protection for up to 600 minutes (10 hours). This, of course, depends on the time of day, whether you are sweating or swimming, the severity of the rays, etc. However you will only be protected up to the maximum. It is important that you take into account sweat, bathing and sun cream absorption though.
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