Every worker can work efficiently upto8 hours provide the working hours and rest hours are distributed idealy, for example i prefer the timings to be:7:30 A.M. to12:30 P.M.. Followed by a lunch and prayer break from12:30 P.M. to01:30 P.M. Finally01:30 P.M to04:30 P.M.
par
Mohd Shahnawaz Khan , Business Development Executive , Hindustan Coca Cola Beverages Pvt Ltd
Its depends on person whether she/he is in a white collar or black collar job, actually its own self who decides to adhere to time.
Duty hour fully depends on nature of business.