Grinding everyone done in a 40 hour work week is a bigger problem though. And it's not like you work highly efficiently in a 40 hour work week. Or if management did enforce that all 40 hours are busy time, the people burn out.

I've worked a factory job and have seen it there, I work in white collar now and it's the same.

If you say 40 hours you'll only get around 30 because workers have to bounce between working and getting down a little or else they burn out.