if i use 920kv motors with 3s 11.1v 2200 MAH lipo having weight around 1kg how much flight time i will get?
please feel free to give any ideas for good flight time....

around 8 minutes.

thanks, bro,
can I go for 4S lipo with this specifications?

Hi,
       depends upon the ESC & Motor Specifications.
using eCalc, you can get an idea of thrust, weight, flight time etc.

https://www.ecalc.ch/xcoptercalc.php

thanks bro