We thought this 24-ounce jug of sunscreen (Supergoop! SPF 30+ Everyday UV lotion, $68;
sephora.com)
would last us through Labor Day. Then we did the math: Dermatologists recommend at least one ounce (about a full shot glass) of sunscreen to cover your body. And you should reapply it every two hours. So say you're on vacation, spending six hours a day outside—this jug should last you about...eight days.
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