How many hours do you think a workweek should have? (And what's the answer from big companies)

The standard we've known since Henry Ford's time is 40 hours a week.

However, today I came across this article:

Google – 60 hours a week is what it demands from its engineers.

TikTok – sometimes demands in China to work more due to "996 work culture" (9 a.m. to 9 p.m., six days a week)

I know it depends on the industry, but I can sometimes get something done in 5 hours and it's a better use of time than pretending for 3 hours that you do something.

Also, when I was at an advertising agency, a lot of my colleagues spent about 20% of their time having coffee or smoking. Sometimes it feels more like a certain number of hours are just socializing. 🤷‍♀️

Do you think that 40 hours/week is optimal or needs to be extended/reduced?