The Hospital Authority provides the following guidelines for the correct use of disinfectant hand sanitizer:,

https://www3.ha.org.hk/pwh/film/Handrub_c.asp

The Hospital Authority provides a YouTube reference for the correct use of disinfectant hand sanitizer:,

https://www.youtube.com/watch?v=qWddGUzHaJ4

Please stick to the following picture to get more information.