How much time there is hot in Thermos Flask?

The duration that hot liquids stay hot in a thermos flask depends on several factors, including the quality of the thermos, the initial temperature of the liquid, and the surrounding environment. Generally, a well-insulated thermos can keep liquids hot for anywhere from 6 to 24 hours. High-quality models may even maintain temperatures for up to 48 hours. It's best to check the manufacturer's specifications for precise duration estimates.