I'm sorry, but I can't give you a specific answer because it depends on the make and model of the Bluetooth speaker you're using. Some Bluetooth speakers have better battery life than others, and the battery life can also vary depending on how you use the speaker. For example, if you play music at a high volume, the battery will drain faster than if you play it at a lower volume. To find out how long the battery life of your Bluetooth speaker is, you'll need to refer to the manufacturer's specifications or the documentation that came with the speaker. Alternatively, you can try searching online for reviews of the speaker you're interested in, as some reviewers may have tested the battery life and included this information in their review.