Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: How long do they stay cool?
Document: these dont hold into the bottle and make it hard to drink with out making a mess.They do cool the beer
They're too long for the bottles of the beer that I drink (model especial) but my friends love them for their long necks.
Great product and it works too! The color was really &#34;cool&#34; and my beer stayed &#34;cool&#34; too!
I have tried it many times and never can get it to cool a bottle if its room temp. It really doesn't do much for keeping a bottle cold either.
I bought this for my mom since she likes to "nurse" her beers. She used it all summer long and even let me borrow one when I came over to visit, haha.
Cool idea bad design. doesn't fit all bottles, chokes the flow and is more of a hassle than its worth. I thought I was going to break the bottle trying to push it in and make it a snug fit.
Bought this as a gift for a beer drinker who buys the long neck beer bottles. Liked the idea of keeping the beer cold while you drink it. Don't know how they work as just given for Christmas 2013.will find out this summer how well they work.
And not  just on one of the products, but did so another one when i went to try it out thinking it was just 1 bad item..Not cool to drink unknown 'water' that gets into your beer when that happends (product states made in China) or the idea that could have choked on the little plastic cap.
You could also toss them inside a wide mouth bottle instead of ice so your beverage isn't watered down after the ice would melt because these are reusable and long enough to reach from the top to bottom of the liquid. Overall it is a great product with many uses especially with summer just around the corner! !
Worthless. Terrible design. I threw mine away. Waste of money! You can't even re-screw your bottle cap on while the cyclinder is in there - you have to leave your bottle uncapped. And then you have to pull out this long dripping cyclinder everytime you take a sip. Messy and embarrassing. Bummed I got these.
Answer: Long enough to drink your beer!