A reason to restrict 8 hours a day of work

As per a study report, working for 55 hours a week causes the risk of stroke by 33% compared to working hours of 35-40 hours a week.

May be studies are also required patterns for continuous hours of work, number of hours of work a day, etc to have more reliable data. 

As per Factories Act and Rules, 125 hours of overtime in a quarter is permitted. But, it is quite common for many persons  to put more hours at work, particularly in unorganized sector like in construction industry. For earning more also, it is quite natural for persons to work for more hours though it leads to strain. 

It will be difficult for anybody to control working hours unless it is practiced by the individual himself. In case of forceful work, then unions have to take the responsibility to protect the persons from the risks.

http://timesofindia.indiatimes.com/home/science/Working-over-8-hrs-a-day-raises-stroke-risk-by-33/articleshow/48550484.cms