It depends on the size and type of plane, how big the control surfaces are and how fast it flys. I was able to get 6 ten minute flights with a 600 mah 4 cell packs. Since I upgraded to 1100 mah packs I fully charge the pack Friday night for Saturday morning and then fly 6 flights each for both Saturday and Sunday with out worrying about it. I do have a Voltwatch in each plane just to make sure however. !