Battery life will depend on the sound used and the volume level.
For example the water trickling sound on the lowest level will last up to 40 hours, whereas the cat purring sound, with its low frequencies, tends to last around 8-12 hours on the lowest volume.
All sounds except the cat purring should last for more than 10 hours on the all-night mode.
Recharging Wooshh takes about 90 mins from empty to a full charge. We recommend removing from charge as soon as the green light shows, to help maintain battery life.