RC helicopters that are relatively cheap but with long flying time?

I know about Syma 107 but lasts only 7 minutes. I want something that lasts a bit more. Like 15 minutes?

hi, all rc vehicles will last very little, but hey, you can replace the battery right?

I fly rc planes and helicopters and the most reliable and good way to get more flight time is to buy more batteries, for example, instead of buying one big as s battery, buy 3 or 4.

by doing this, you won't kill the helicopter's perfomance, if the Syma 107 gets a bigger battery, it will be kind of the same flight time because the motor will have to work harder to keep the extra weight in the air so the best way to get more flight time is to make sure you buy an helicopter with a removable battery so you buy more batteries and enjoy flying…

also, before using the other battery, let the motor cool down for like 5 min, if it's for more, it will be better, those motors work really hard, believe me…