With the DN's you should get around a 10 minute flight, I have had instances of 13 to 14 minutes but that is very rare, and was only doing hovers and spot landings. You will find that after a 10 minute flight everything is going to be hot. Motors, and lipo's will be warm to the touch. Once you are down remove your lipo and let it cool at least 20 minutes before putting on the charger. There are several threads and topics on lipo memory as well. Some do a breakin to set battery memory, the short version looks like this....fly 1 minute charge, fly 2 minutes charge, fly 3 minutes charge....right up to full run. I personally haven't tried this however I'm just out of my rookie pants so I haven't had lipo's long enough. On my new bird I'm going to try the above and see if I notice any improvement.