Depending on the vibrator device and what kind of batteries you're using, you
could get anywhere from 50 hours of use to just 10 hours. Smaller
devices with smaller motors drain less current. Larger vibrators or
ones with multiple moving parts will drain batteries more quickly. If
you have a high-drain vibrator that you use frequently, it might be
worthwhile to invest in some rechargeable batteries. They don't hold a
charge as long as disposable batteries, but you also won't have to
spend five bucks every time they're used up. You can extend the life
of your vibrator's batteries by removing them from the toy when it is
not in use and storing them separately.