How to properly use sunscreen

If the SPF is high, you do not need to reapply it for a long time. (X)

Often, if the SPF is high, people tend to apply it only once.

Let's break the formula we know that SPF 50 x 15 minutes = 750 minutes (12.5 hours of protection).

To maintain UV protection regardless of whether the SPF is 30 or 50, regardless of the UV protection factor
You need to reapply it every 2 hours.

A high SPF rating means that it blocks strong sunlight more densely, not that it blocks it for a longer period of time.

Let's not forget that it is not that.

Applying sunscreen the first time is important, but I think reapplying it from time to time is also important.