And truthfully, it is going to depend on the person to at least some extent as well.
IMO, anything that doesn't include being at work as part of your actual job duties should have no number of required work hours. You either get enough work done or you don't. If you aren't getting the expected amount of work done, then you'll eventually get fired. If you can out perform everyone else on the team and work 8 hours a week, so be it(just don't expect to get any brownie points when it comes raise time unless you put in more time).
Things like retail/food service are obviously things that require being at work certain hours so talking about shortening hours for that time of work is productive. For creative work/management/executive work though, I think we should move to a more flexible approach.
IMO, anything that doesn't include being at work as part of your actual job duties should have no number of required work hours. You either get enough work done or you don't. If you aren't getting the expected amount of work done, then you'll eventually get fired. If you can out perform everyone else on the team and work 8 hours a week, so be it(just don't expect to get any brownie points when it comes raise time unless you put in more time).
Things like retail/food service are obviously things that require being at work certain hours so talking about shortening hours for that time of work is productive. For creative work/management/executive work though, I think we should move to a more flexible approach.