Having put in Private Sector for more than 30 years, there are generally two sets of employees, management and non-Management cadre, and from Management cadre employees, particularly those working in the Plants and living in the adjacent township, it is expected that they are always available to attend all the emergencies round the clock and there is no compensation is granted for the such cadre of employees due to inbuilt such obligation to the position.
Even if you see your State Factories Rules, a certain class of employees are exempted from the provisions of Sections 51, 52 etc, and are permitted to work beyond the statutory limit of working hours.
In the above case, if there is any system of payment, you can compensate for 5 hours and not for 8 hours provided you are not deducting any salary for inordinate late coming or early going.
Dr Kamlesh Agrawal
Mumbai