Is applying sunscreen once a day a waste of time?

A lot of people apply sunscreen once a day in the morning as part of their skincare routine. However every sunscreen I've seen tells you to reapply it every two hours. So does applying sunscreen in the morning give you some amount of UVB protection all day or is it a waste of time and your sunscreen won't be doing anything by the time you get to peak sun exposure hours in the afternoon? Thanks

Comments

  • I think anything you do is better than nothing. Consider that you are not sweating a lot or in water on a typical day. Particularly if you use a mineral sunscreen, it may not budge (chemical filters do break down).
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