You can do this just after getting to the second Assingnment, but you're not in a hurry so try this after you ended the game. Just load any savegame beyond the second Assignment and do... nothing.
Show how lazy Rorona can be. Sleep the whole assingment time and when the Evaluation day comes, Stern will give you the bad news, the workshop will be closed but hey! you'll get a trophy, so don't be sad.