Anniversary Balloon Contest

This is the balloon Josh bought me for our 1-year anniversary. As you can tell it is still up. Some of the helium has come out, but it is still at the top-most corner of our apartment. We think this is pretty amazing since most mylar balloons are down in about a week. So I thought of a contest we could do. Anyone who wants can guess how long they think the balloon will stay up and whoever is the closest to when it actually comes down will be the winner. There will be a prize involved. It is now at day 40 of being up. I will try to put a timer or something at the side of the blog to keep track of how many days it's been up. Good luck everyone! Please just put your guesses as comments and I will let you know who the winner is. :)