It depends! If your kid is constantly playing with the balloon (shaking it, pulling at it, sword fighting,) it might pop. It also depends on environmental factors and the design of the balloon. They can last from around a few days to 2 weeks. I have made some balloons that I then left on my desk and they lasted over 3 weeks (but they won’t look as shiny and new.)

If you draw on the balloon, use a non-acidic pen, or your balloon may deflate prematurely. Also, balloons don’t like direct sunlight/heat.