Each individual Glo Pal Light Up Cube lasts for a minimum of 16 lighted hours. What this means is that the product automatically turns on when placed in liquid and automatically turns off when removed from liquid. Only the time that the product is lighted will count against the battery life. On average, a Glo Pals Light Up Cube should last for several weeks and each cube has a 30 day warranty from the date of purchase. We do encourage you to read the article "How Do I Store the Glo Pal Light Up Cubes?" to ensure your Pals last as long as possible.