Hi Andrea,
within COOIS and 'PPIOO000 Operations' list, in the display layout, select the fields that allows to display the working hours. In my sandbox system, they look like the following (planned / actual hours):
Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
Hope this could help.
Thanksd and regards,
Flavio