Yes, I believe that the present system of five day schooling is proper and holds good for children. In fact, it is not the days which matters to the children it is the level of burden of studies which matters to the tiny tots.....
Perhaps five day schooling prepares the child physically and morally to cope up with the burden of real life when they grow up and has to work in office or any other organisation where they would have to work for at least five days and they don't find anything unusual about it....