This master thesis analyses legal regulation and related theoretical and practical problems in labour law of working-time, working-time duration and working-time regimes. In accordance with the law, working time is defined as the calendar time during which the employee performs work functions aligned with the labour or collective agreement. It is noted that the objectives of working-time, working-time duration and working-time regime are distinguished in this work. In the authors opinion, one of the main aims of such legal regulation is to protect the health and (or) life of workers by determining (limiting) the working-time. This master thesis identifies three main types of working-time and the problems of legal regulation. Normal working-...