Shark says itself: Up to 24 hours at level 1 without oscillation. At level 3 with oscillation, it will probably "cool down" after a few hours... Providing a cool breeze during the night is easy, however, as you will probably only want a maximum of level 2 anyway. If you then need more power, you could even connect the mobile part to the mains (using an extension cable).

I haven't tried the battery yet. The device has worked perfectly so far.

I haven't tested it yet, but it can be assumed.