To become a Brigadier in Army you  need  a lot of time to get promoted to the rank of Brigadier as the only entry point for Officer in the Indian army  is at the rank of Lieutenant, through NDA OR CDS.

You will require minimum of 23 years of service to get promoted to a Brigadier and it is very less probable to get promoted post colonel as most officer retire on or before this rank.

After your commissioning as lieutenant the promotion is as follows

Lt. (On completion of training)

Capt. 2 years of reckonable commissioned service

Major 6 years of reckonable commissioned service

Lt. Col. 13 years of reckonable commissioned service

Col (TS) 26 years of reckonable commissioned service

“ The Qualifying service for consideration for promotion by Selection is as under ”

Col. 15 years of reckonable commissioned service

Brigadier 23 years of reckonable commissioned service

Major Gen. 25 years of reckonable commissioned service

Lt. Gen. 28 years of reckonable commissioned service

General No restrictions