Ice will last for hours!
I bought this because I had found a co-workers that she had left 9 hours before. It still had ice in it. I'm a nurse and I cannot keep refilling my glass. Plus, I hate watered down drinks. The more ice you add, then the longer it last. Mines lasted a whole 12 hour shift with tea. It's the only thing I use for work now.
Rating: 5 stars