SPF 50 sunscreen, under average conditions, typically provides protection for approximately 3 to 4 hours. However, factors like sweating, swimming, or being in a place with a strong UV index can shorten this duration. It's recommended to reapply SPF 50 every 2 to 3 hours in these situations.
While SPF 50 might seem like it offers double the protection of SPF 30, the difference in protection is actually quite small. SPF 50 blocks around 98% of UVB rays, while SPF 30 blocks about 97%. Reapplication remains crucial for both, regardless of the SPF level.
