I think that’s why it’s sometimes important to just leave from work, if you’re doing something hard and get stuck. If you keep working hard, you may not find any solution. It happened really often to me, that on the next day the solution for the problem was „just there“.

It just doesn’t fit our working culture, if our leave two hours early and if the boss asks you say: „I have to do a lot of complicated work, that’s why I’m leaving early“.