The developers seem to have shunted that to the community to fix. There's a comment along the lines of 'I'm sure somebody will make a gadget for that'.
Madness string 93259
Force 4 days on earth; they already exist. 4 horsemen have 4 days in only 1 earth rotation. 4 angles stood on 4 corners. 4 corners rotate to 16 corners which equal to 4 corner days.