How Long should I Wait between the steps of my Skin Care Regime?

- To maximize the efficacy of each product (moisturizer, serum, oil, sunscreen, etc.), do we need to wait a certain amount of time in between applying each one ? 

- We don't need to set a timer in between applying products, or even count in your head, but should wait until each product dries before reaching for the next — about 30 to 60 seconds. 

There's no magic number because the time it takes for a certain product to penetrate the skin (and feel dry) varies, depending on the product type and quality