SND Gold Collagen Eye patches may reduce the appearance of dark circles and improve the skin's texture by increasing collagen production 100% PURE recommends leaving the eyes patches on for about 20 minutes or until they start to shrivel, which indicates most of the good stuff has been absorbed into your skin. Under-eye masks give almost instantaneous results so it's best to use them frequently. You won't continue to see a change in the appearance of your under eye appearance for more than a day from application so it's best to use these 2-3 times a week to reap the full benefits. Keeping using it.