I've got most of an old 2QT Stanley SS. I write "most" because the handle broke off about 30 years ago, and I write "old" because it's about 40 or 45.
We routinely take it on our Fulton, Mississippi to Alexandria, Va "commute", which takes 12 to 16 hours. If the thermos is preheated (as recommended) it will keep the coffee hot for about 4 or 5 hours, which by then we've usually drank 1/4 to 1/2. Often, if the coffee lasts, it will still be lukewarm at destination.
I like simple tools that work well for a long time.