What is the minimum recommended time for handwashing friction?

• A. 10 seconds
• B. 20 seconds
• C. 40 seconds
• D. 60 seconds

Answer: (B)

The main idea here is that washing hands effectively relies on enough rubbing action (friction) for a sufficient period to physically dislodge and wash away germs. The minimum time recommended for this friction during handwashing is about 20 seconds. This duration ensures you can systematically rub all parts of the hands—palms, backs of the hands, between the fingers, and around the nails—so soap can lift microbes and the mechanical rubbing can remove them. Shorter times, like 10 seconds, typically don’t provide enough coverage to remove many germs, leaving contamination behind. Longer times, such as 40 or 60 seconds, aren’t necessary for routine hand hygiene and can impede workflow, offering little extra benefit for standard practice. So, 20 seconds is the appropriate minimum for effective friction-based handwashing.