[asgard1024]

> I wonder if "work" hours are not shorter because culture dictates it, so many people shift their habits to surf the web (i.e. leisure activities) while at work.

I think you're right and this is similar to what David Graeber wrote somewhere. In former communist countries, the working class people actually had more leisure at work, except they had to pretend they don't. This was probably part of the reason why these systems were so economically inefficient, compared to first world countries.