[StefanWestfal]

Did you consider that you might not have the right contract for this type of situation? There a lot of jobs (hospitals, consultancy, ...) that do not fit the standard work agreement (08:00-17:00, 1h lunch, 40h/week). The law is strict here for the case that it turns out that your agreement was in fact not mutual and your employer expects you to work normal after your overtime phase without rewarding you for it. The german law is convoluted and can be inflexible but more often then not there are solutions. I am also not sure why you would be afraid talking about it?