The duration of the battery and the miles traveled is not necessarily the one indicated (like all hover board), but it is according to the weight and use. But sometimes it may be caused by many unsteady factors like: temperature,humidity,electromagnetic interference,player weight,method of application,ect,.
The hoverboard usually can use about 30-50 minutes.
Please don't overcharge the hoverboard, it will damaged the battery life. Don't charge for more than 4-5 hours.