Hi Vishal, I do not think it will take time to make the rental agreement. You just have to hire a broker or you can also take help from legal expert in this matter and it will be done in a day. You can also prepare your rental online if you wish to, check the link http://indiarentalagreement.com/
You can also read this article to know facts that you should keep in mind to make the agreement legally binding and valid: Rent agreement: Points to remember