I've only been using this carafe for about a week and I can estimate that it keeps my tea hot for at least eight hours. What REALLY impressed me, however, is that last weekend I left about 10 ounces of very warm (not hot) coffee in a carafe and put it in the fridge overnight. I took it out of the fridge the next day around 4pm to warm up my tea and found it was still warm! I'm ordering another one as a Christmas present for my mom.
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