No, it doesn't. We understand why you may think so, but that is not what the numbers mean. This number is to give you an approximate value of how long you have before your skin may start to burn.
So, for instance, if your skin burns after being in the sun for 2 minutes, applying SPF 30 sunscreen would increase the time to 60 minutes. Here is how:
Protection time = SPF × Burning time
Protection time = 30 × 2 minutes
Protection time = 60 minutes Read more