Because Insta Glow is a tinted gel, you may notice a difference within 15 minutes after applying the product. However, depend-ing on your natural skin color and the amount of product you’ve applied, it will typically take between 30 minutes and one hour for you to notice a difference in your skin’s color. The maximum darkening with DHA (or dihydroxyacetone) will then take 8 to 24 hours.