I am pretty new to electrics and I was wondering if there is a way to fiqure out how much run time a certain motor,esc,prop, battery combo will get? I know it will change depending on if you use full throttle, partial throttle, etc. I want to buy an Eflite mini ultra stick and Horizon reccommends using a 3-cell 2100mah back but I have some 3-cell 1320mah packs and I was wondering how much run time I would get out of them.

Thanks,
Tony Gagliardi Jr.