Practically, however, only limited warming time

This pot has a large opening so that I can hang with no problem my Teenetze. The usual hissing soliloquy this thermos leads unfortunately also from time to time. Now I do not count to the community of foodies and
would like to have in the early afternoon a cup of hot tea, I've put on in the morning. That does not work with this pot. At the latest after about 3 hours everything is very tepid. But OK, you just have to drink faster.