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 comments

  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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