I don't have any resources myself, but you can try googling for "studies that show how shorter working hours increase productivity".
Here's one: https://cepr.org/voxeu/columns/teams-become-more-productive-when-their-hours-are-shorter
I don't have any resources myself, but you can try googling for "studies that show how shorter working hours increase productivity".
Here's one: https://cepr.org/voxeu/columns/teams-become-more-productive-when-their-hours-are-shorter