That depends on the model of YETI drinkware.u003cbr/u003eThe YETI Rambler bottle seems to keep hot drinks somewhat hot all day as long as the cap is put back fairly quickly after each use. The ambient temperature outside does not matter - this thing lasts!u003cbr/u003eu003cbr/u003eAs to the YETI mug and tumbler, it's many hours. I left my tumbler in the car and found it hours later with coffee still warm enough to enjoy. That's not always the case on super cold days. The lids on these are not overly insulated, and the length of time depends on the outside temperature.