Michigan State University's study reveals 38% people wash their hands for 5-8 seconds. Further research is needed to validate the findings altogether.
Only 5 percent of people who used the bathroom washed their hands for 20 seconds as recommended by the Centers for Disease Control and Prevention (CDC) according to the study. Thirty-three percent did not use soap, and 10 percent did not wash their hands at all. Men were particularly bad at washing their hands correctly. Among 3,749 people, 1,432 (38.2%) people wash their hands for 5–8 seconds (Refer: Page number 4 in web archives).
However, based on one study from 2013 based on a small group, it cannot be entirely ascertained that people wash their hands less often. Apart from Michigan State University, there are no further findings from other research or university. Further research in the current time is needed to corroborate the claim altogether.