Working timings for a physically handicapped lady officer in public sector bank

Greetings for the day! I humbly want to ask about any law for the working hours of physically handicapped lady officers in the public sector banks. I am a fully hearing impaired lady officer in a public sector bank and due to my own virtue of dedication to my institution and services, i used to stay late till 7 pm or later. However, I never received any overtime payment or any kind of emoluments for staying late on duty. But, I have noted that I am being compared to other officers in this matter as they sit late till 7PM or later. AsI have not instructed in written for the same, I have decided to stay only half or One hour more after usual time of duty i.e. 9.45am to 5.00PM of our bank and started to leave till 5,30 PM or 6.00PM. I need any legal protection for the same so that I may not be proved incompetent for duty on account of my departure time, in comparison to my other normal healthy counter parts. I shall be highly obliged for your kind guidance. regards- Arpana Sharma