The entire handwashing process should take about 20 to 30 seconds for effective cleaning. The key scrubbing duration where hands are vigorously rubbed with soap is at least 20 seconds to ensure all areas, including palms, backs of hands, between fingers, and under nails, are cleaned properly. Washing for less than 20 seconds is less effective in removing germs and bacteria. Some sources note the full process including wetting, soaping, rinsing, and drying may take up to 40-60 seconds, but the critical scrubbing part is around 20 seconds.
Recommended Handwashing Duration
- The Centers for Disease Control and Prevention (CDC) recommends scrubbing hands with soap for at least 20 seconds.
- The WHO mentions that the entire handwashing procedure can take 40-60 seconds, covering all steps including drying.
- Proper handwashing includes wetting hands, applying soap, scrubbing for 20 seconds, rinsing, and drying.
- The 20-second scrubbing ensures thorough cleaning of all hand surfaces and effective removal of germs.
Why 20 Seconds?
- This duration allows enough friction and coverage to clean between fingers, nails, and wrists.
- Soap works by trapping germs and dirt in micelles which are then rinsed away.
- Physical scrubbing is necessary, and 20 seconds is the minimum time to ensure effective germ removal.
Practical Tips
- To keep track, humming the "Happy Birthday" song twice approximately equals 20 seconds.
- Proper technique during the 20 seconds is crucial for efficacy, not just the time itself.
In summary, the crucial scrubbing step of handwashing should take at least 20 seconds , while the entire process including wetting, rinsing, and drying may be up to 40-60 seconds for best hygiene practice.
