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If you actually read the first document you linked to, it says (for the handwash): "Duration of the entire procedure: 40-60 seconds". If you watch the NHS video in your second link, you will see it is 41 seconds long (41 is a number between 40 and 60, by the way). The 20 seconds refers to the part where you rub your hands together; the video even times it and plays Happy Birthday twice!
Regarding the duration of hand washing, 20 seconds has been mentioned on here as well as elsewhere so many times that I had to check the NHS website. Worryingly, it does say 20 seconds. Did they just copy the WHO guidelines (40-60 seconds) and just cut n paste 20 seconds from the same organisation´s HAND RUB guidelines?!
https://www.who.int/gpsc/5may/Hand_Hygiene_Why_How_and_When_Brochure.pdf
https://www.nhs.uk/live-well/healthy-body/best-way-to-wash-your-hands/
There is no fucking way anybody could possibly cover all those steps in a mere 20 seconds.