BlazePods typically take around 5 hours to charge. You stack them on top of each other so all of them can be refueled at the same time. A fully charged pod is good for up to 12 hours of operation. This is plenty as exercises typically last only a few minutes. When fully charged, BlazePods will blink green. At other times they will shine a blinking red color. Although all pods are refueled at the same time, they will vary in how long each takes to charge.