Keeps really delivers what it promises.

There are commercially very nice and also inexpensive insulated containers, in all sorts of designs. Who benefits from this, if not hot drinks stay hot long enough.
We bought the mug mainly due to the long holding time. The exterior was a minor matter, but also fits very well. If one fills properly hot drinks, it holds even a bit longer than as indicated. In any case, as long as specified, even if the content somewhat reduced over time, by abtrinken.
That's the way it has to be. Since you are also like a little more time out, wenns works.