How long does a Mylar balloon float?

As you may remember, Julia celebrated her first birthday with a party five weeks ago. As part of the party, we got some Mylar balloons, and about a dozen regular balloons. The regular balloons lost their helium and came crashing back to the ground after just a couple days. However, two Mylar balloons are still floating, attached to a couple end tables in the living room.

So here’s my question: how long do you think these balloons will keep afloat? Leave your guess in the comments.

10 Replies to “How long does a Mylar balloon float?”

  1. One balloon is hovering right above the carpet, the other is still going strong. I took this picture a couple days ago.

  2. “So here’s my question: how long do you think these balloons will keep afloat?”

    So how long did they last?

  3. I bought my wife a Mylar for her birthday on Sept 29 and as I am weighting this on March 29th the dmn thing is still floating!

  4. A mylar balloon was given to my sister for her birthday on March 24, 2010 and it is still floating January 2, 2011.

  5. My daughter bought me a mylar ballon for surgery on march 18th 2010 and its still floating january 29th 2011

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