Most of the mini drones that you see today need to be charged for atleast an hour. Moreover, they have a flight time of 5-7 minutes. Some of the latest models on the expensive side do make it till 10 minutes. However, you need to make sure to buy some extra batteries. This is a prerequisite. You should check the battery feature before buying a mini drone. That will give you a positioning over others. After it is completely charged, its light turns green from red. You can even extend the longevity of the battery, by charging it at the right time. Always follow the instructions on the package to make it a successful buy.