Legally not permitted, but if you think that allowing an employee to work six hours over and above the scheduled 8 hours is necessary for the benefit of the organization, you can do it. However, it should not be a regular practice.
Your question is too short and seems vague. Is this an actual problem, or have you been given a case study that you are trying to solve? I suggest you provide the full details and background of the matter if you want a good response on the forum.
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