As much as Bruno spent his time developing new weapons for the Reich. Which hopefully would be adopted into service and mass produced in time for the upcoming Great War that would begin in the following decade, assuming the timeline had not shifted to the point where it would move up.
Bruno also spent a lot of his days with his wife, Heidi. While he would cook breakfast and lunch for her, because she was nearing the end of her pregnancy, and he wanted her to rest as much as possible. He would often neglect lunch, as he was too busy with blueprints.
Causing the woman to voluntarily make a meal for the both of them, and bring it to her husband while he was hard at work in his home office. Despite Bruno's attempts to keep his wife off of her feet during such a crucial time. She very much enjoyed doing small things like cooking for her husband, and utterly refused to be robbed of it.