The Emotiv Insight will last a minimum of four hours on a full battery charge. Recharging will take anywhere between 30 minutes and 2 hours depending on your charge source (some PCs have a limit on the current that can be drawn from a USB port).
Emotiv Insight will be supplied with a USB charge cable so you can recharge directly from your laptop or from any USB charger. Note that the headset will not be able to operate while plugged into this kind of power source. We can’t predict whether your power source is electrically safe (there may be a power supply fault in your device which allows the electrical mains to connect directly to your head) so we can’t allow normal operation during direct charging.
You can extend the battery life for the device with the Emotiv Insight Extender.