Detailed answer

Sunscreen should be applied every two hours to maintain its effectiveness. This is because sunscreen gradually loses its ability to protect the skin from harmful UV radiation over time. Additionally, it should be reapplied immediately after swimming or sweating heavily, even if it has not been two hours. It is important to apply sunscreen generously to all exposed areas of the skin and ensure that it is evenly distributed. Remember that using sunscreen alone is not enough, and it should be combined with other protective measures like seeking shade, wearing protective clothing, and using sunglasses to protect your skin from sun damage.