Agreed. While in USA, it would be 6 months, here 12 to 18 months. 24 months would be too much money on a car, beyond your means.

Also down payment about 15-25%. Having just about 10% shows that it is too early and should save more; showing that there's too little savings to afford that particular car at the moment.

To be financially prudence, loan should not be more than 5 years. 6 years is pushing it, yet still okay for a first car. Beyond the 1st car, should be financially sound to handle higher installments, keeping it less than 4 years.