The Travel Mug 2 is a great cup to use at home and around the office, and now that there is a car charger for it, the mug has become a good one for road trips and taking to visits at client locations.  The battery lasts anywhere from 1.5 to 3 hours.  It is hard to really predict so I generally just assume around 2 hours at the most.  If I pour coffee into it at 190º then maybe it would make it to 3 hours.  

I really LOVE being able to control the temperature from the mug itself instead of needing the phone to do it like my other Embers.