Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: How long is a full charge good for?
Document: Have been using this for about 3 weeks now while working out for an hour to an hour and a half 6 days a week and have not had to charge it yet. The sound is great and the talk quality is good as long as your in the same room as the phone. The only thing I don't like is there is only two buttons with multiple uses that you have to hold down for different lengths of time to operate. It's hard to remember all the things they do.
I love it. This product does give a good sound, keep charge,  loud enough,  and easy to use.would recommend this to a friend.
For their price these headphones are fine. The sound is decent, picking up good bass and clear treble. Best feature is the wireless option. You can wire them without a need to charge them up. Work well with my iPhone and keeping noise away.
Cheapest BT headset (at least during the time I bought it) around for the quality. This sells for almost double the price at a local electronic stores. Everything is good. If there is one small issue, it is slightly tight for my head. (My head is not unusually big.) Since it presses on my ears and make them hot, so I tend to not use it for a long period. Kind of work as a neck warmer too.
Great sound quality, durable, comfortable. Long battery life. We have owned lots of headphones over the years and these are the best.
Surprisingly the white headphones have not become stained or darkened by dirt, oil, etc. And it holds a charge VERY well.But I do wish the LED could be muted or turned off so that I do not light up a dark room like I was wearing a distress beacon. I wish there was a simple way to use the headset with all my bluetooth devices rather than pair it anew with each one.
I ordered these from positive reviews on Amazon, I was however sorely disappointed.They are a comfortable fit, as a positive. However, they seep sound quite loudly outside so others nearby will surely be disturbed by whatever you are listening to.The major complaint I have with this model is that it does not maintain its charge. Using them shortly before bed wirelessly, and shutting them off after say, about a hour of usage, still results in the battery being dead by morning and needing charged once again.
I purchased these as an inexpensive set of Bluetooth Headphones for work. My job requires me to move about my work space a lot and these effectively cut the cord.I tried the higher rated Photive BTX6 headphones after being spoiled with my Sennheiser HD202 (inexpensive, awesome full sound, just with a wire). The Photive's had terrible presence of sound, very muddy.
Good
Good range on the blue tooth
Answer: At least 8 hours, it seems like my son never charges them and they always work.!!