Personally I wouldn't really know much about sun protection lotion because I don't really like the sun so don't go in it lol But what I would think is that if you apply the cream once it should be enough, especially if it's SPF 30, however if you tan easily or you have sensitive skin then you should re-apply just to be on the safe side
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It kind of depends on what sort of outcome your looking for. BUT, if you don't want to get sunburned, RE-APPLY. SPF 30 only means it protects for 30 minutes. (i think). So yeah. I would google it, haha.
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