I suppose the same forces that usually prevent a move from a 5 day week up to a 6 day week: it's unpopular and counterproductive. But I wouldn't be opposed to a

I suppose the same forces that usually prevent a move from a 5 day week up to a 6 day week: it's unpopular and counterproductive. But I wouldn't be opposed to a 4 day week being privileged in law somehow.