There's no set rule, according to Nazarian. Though you should definitely taking your makeup at night: "Skin does a lot of its healing and renewing while we sleep at night, so my general rule to my patients is that makeup MUST be thoroughly removed before bedtime so the skin can recover properly, at least 6-8 hours at night," she says.
Image via Imaxtree
"Use a makeup removing wipe (one that's good for even waterproof formulas), and follow with a gentle cleanser to rinse off the residue. (I prefer unscented gentle cleansers like Dove Sensitive Skin Beauty Bar, $2.99)," advises Nazarian. "Pat skin dry, and apply a lightweight calming oil-free moisturizer (Cetaphil or Cerave lotion is a good option)."