Sometimes, when I have yet to reach Optimal Coffee Levels, I set my mug down and. . . forget to sip The Holy Brew while it is at the proper temp. I used to keep an electric cup warmer on my desk for those times when my mind wandered, but my last use of such a thing was ~20 years ago, so. . .
REALY effective “silver bullet” thermos that holds a coupla mugs full of coffee. Pour some into a teensy lil eleven ounce cup and sip. Even if my mind wanders to something task-oriented and I let it cool, it’s usually only a coupla ounces that are cool and easily warmed up to nearly optimal temp with a refreshing from the thermos.
I know, I know: it’d be better to just practice better coffee/memory discipline. *shrugs* Lazy, I guess.