Based on the Centers for Disease Control and Prevention. Coronavirus Disease 2019 (COVID-19): Steps to Prevent Illness. https://www.cdc.gov/coronavirus/2019-ncov/about/prevention.html?CDC_AA_refVal=https%3A%2F%2Fwww.cdc.gov%2Fcoronavirus%2F2019-ncov%2Fabout%2Fprevention-treatment.html
The Centers for Disease Control & Prevention recommend you clean your hands often by washing for at least 20 seconds with soap and water or by using a hand sanitizer that contains at least 60% alcohol.
To help you judge how long 20 seconds is try one of the following: