A:Answer The buds themselves hold about 5 hours. Each bud can be used independently. Also, the case charges the buds. So, it depends on your preferred use case. If you must have both buds in your ears all 8 hours, they won't last that long. But, if you work for 4 hours, take a lunch break where they can go back in the charging case, and then come back and work for another 4 hours, they'll last you through the day. Or, if you can listen in one ear for a period of time, the other bud can be recharging, so you can easily get through a full day moving from one ear to the other.