Q1: How long does it take to heat a cup of cold milk?
Answer: Mug Warmer design to slow down the cooling speed of hot beverages, not design to heat up cold beverages.
But we do the test, heat up a cup of milk from 86℉ to 131℉ is about 80 minutes, but it is a general time, not accurate. Because the effect caused by a variety of reasons as milk capacity, cup material, and cup shape and etc.
Q2: I like very hot beverages, this mug warmer suitable for me?
Answer: If so, we do not suggest to use this mug warmer. Our mug warmer usually keep your coffee about 30-50°C (86 ℉-122 ℉). Scientific research shows that the appropriate temperature for eating is around 10 to 40 °C (50 ℉-104 ℉).