Dear Himanshu,
As per the factories act, 1948, where in the clause of working hours described as follows:
For an adult, 8 hours in a day and
Overtime is maximum 2 hrs in a day and
total spread over maximum 11 hrs in the working premises.
By the way, an adult can work maximum 48 hrs normal and OT is 12 Hrs and totally 60 hrs can be allowed to work in a week.
Apart from that, 48 hrs of OT can be maximum allowed in a month and also only 50 hrs can be allowed for any three consequent months in a calender year. (Eg. May- July)
regards.
Boopathi