The insulation time of a thermos depends on factors such as the material, structure, and insulation technology of the cup. Generally speaking, high-quality thermoses perform better in terms of insulation time.

The insulation time of a thermos is usually divided into two aspects: insulation time and cooling time. Insulation time refers to the time that the thermos can keep the temperature of hot water or beverages after they are poured into the thermos. Cooling time refers to the time that the thermos can keep the low temperature of ice water or cold beverages after they are poured into the thermos.

Generally speaking, high-quality thermoses can perform better in terms of insulation time. For example, some high-end thermoses can keep the temperature for more than 12 hours, while ordinary thermoses can keep the temperature for about 6-8 hours. Similarly, there is a similar difference in cooling time, with high-quality thermoses able to keep the temperature low for more than 24 hours, while ordinary thermoses can keep the temperature low for about 12 hours.

It should be noted that the insulation time of a thermos is also affected by the usage environment, such as room temperature, temperature changes, and the temperature of the liquid inside the thermos. Therefore, in actual use, it is also necessary to choose a suitable thermos according to one's needs and usage environment.