Hello ! i would like to build a drone to lift at least 10kg (for delivery) .I have 4 motors with each 3170 g of thrust so the drone will have around 12680 g of thrust. Do you think it can fly with a 10kg load (the quadricopter weight will be around 2 kg) ?
If yes :
Second question : With a 6s 10000mha batterie and a  10kg load will it have at least 15 to 20 min of flight time ?

Thank you

You will have a difficult time flying if max thrust is 12680g and your quad and payload is 12000g. On top of that 1300ish g lipo. You would not even lift off let alone fly. Most recommend that you hover at least 50% throttle. So at 50% thrust, you want your quad lift off. This way you have thrust to comfortably control the quad. My guess, 4kg is the most you can safely carry.