Working Hour in Paramilitary Forces

ईद उल अजहा की मुबारकबाद WHAT IS THE MAXIMUM WORKING HOUR OF A CONSTABLE IN PARAMILITARY FORCES LIKE in Border Security Force AND WHICH LAW HELPS THEM IN THIS REGARD. Because these days they are forced to give their duty upto 18 hrs if deployed in border. And what work time minimum facility they are entitled. And which law helps them.. Because THE BORDER SECURITY FORCE ACT does not say anything in this regard.. Thanks. Your reply is a salute to their hard work.