The exemption is valid for one time and no expiry date in the letter, until you use it one time, indefinite validity until you use it one time.

How many days is the exemption order valid? any one can answer me?

which phone number did u use to contact MHA? give me that number

Did you get any further reply from them? i also have to leave to india to take care of my mother

what is the contact number in immigration to follow up the abf travel exemption?