Dear Chatgaya1,
The condition of serving a notice period upon submission of the letter of resignation is always mentioned in the appointment letter. Now, whether it is legally admissible to change the condition or not that other members will explain. However, my explanation is limited to the
Indian Contract Act, 1872.
The principle of equal consideration is one of the basic principles of the law of the contracts. Its essence lies in finding a fair balance in the exchange between parties when establishing bilateral (consensual) contracts parties.
In your proposal, regarding the length of the notice period, a fair balance does not exist between an employer and an employee.
Thanks,
Dinesh Divekar