Flight time with the stock SuperCub / batteries will be around 8 / 10 mins but no more, it comes in the UK with a car charger and not a mains one and takes about an hour to charge.
The MiniMag I had was using 2200 Lipo's and getting 23 mins per battery but then also had suitable batteries for when I moved up to the next step / planes as well and now use same / similar size in all my 45 / 49" planes.
Don't you have some batteries / charger from your Heli's ????