Wow! I was given this thermos as a gift over the weekend, and my initial reaction, after trying it out today, is 'wow!' I filled it with coffee this morning at 8:30, throughout the day, I poured myself a few cups, and it was always steaming hot. When I came home this afternoon, at 2:30, I poured what remained into a mug, and it was still steaming - six hours later. I shouldn't be surprised, though, as Bald Mountain Coffee explains that "This unit keeps beverages hot, or cold, for 24 hours! The Element 5 units are portable, rugged and leak-proof for the most extreme conditions." That's what I call a thermos!