> It's at least 20 seconds of solid rubbing, people, not just in and out of the water. The temperature doesn't matter, what matters is being under there for long enough the germs come off.

Anecdotally, I don't wash for anything close to 20 seconds and I'm sick much less often than my coworkers who do. I'm also not afraid to touch food with my hands

>... Of those that exist, nearly all have measured reductions in overall numbers of microbes, only a small proportion of which can cause illness, and have not measured impacts on health. Solely reducing numbers of microbes on hands is not necessarily linked to better health.

https://www.cdc.gov/handwashing/show-me-the-science-handwash...