With a good charge, your Star Ceiling will glow all night long. But it depends on what kind of light you use to charge it and for how long. Some factors that can be of influence include: how sunny the day has been, what type of light bulbs you use, and whether the light was pointing to the ceiling or not.
The paint manufacturer guarantees you’ll be able to recharge your Star Ceiling night after night for at least 10 years. But from what the research says, it’ll probably be more like 20 years. That means you’ll get between 3,650 – 7,300 nights of enjoyment under your own personal starry night sky.