That of course depends on quite a few things, how bright do you run it, do you use blink mode, are you using red or blue? But, let’s go with “approximately” answers so you can get a feel for it. The BusyBox S can run more than 120 hours non-stop on a single charge in a low-light setting, and 40+ hours in a normal bright room setting. The BusyBox D is designed to run 10+ hours under normal conditions. Why the difference? The BusyBox S uses 20 high powered LEDs, the BusyBox D uses 614,400 low powered LEDs. So, the math is too tricky to nail down how it’ll work for you. Luckily, it’s easy to recharge, and recharges quickly via using USB-C.