Hi! I have a Dynaflight Butterfly 3ch. powered glider that I like to take up really high and set the engine to idle and then see how long I can keep it up for.. I am currently using a standard futaba 600mah 4.8 battery for the RX.. How long can I safely stay up with this battery.. Im just running the 3 standard servos with the battery.. I have made multiple 10 min flights on a charge and the voltwatch says I still have full power. do you think it would be safe to stay up for 30-40 mins or is that pushing it? Thanks!</p>