(1) Police officers, though liable to perform duties for any length of time as may be required, shall not normally be expected to work for more than eight hours a day.

(2) The duty hours of police officers may exceed beyond eight hours in a day in case of any unavoidable or emergent duty.

Provided that not police officer shall refrain from discharging any duty assigned to him or withdraw himself from any urgent or essential duty without the permission of superior officers on the ground that he has worked for more than eight hours in any twenty-four hour period.