The reason the pack is used for 15 minutes

I was curious why the pack's usage time is 15 minutes, so I looked it up.

They say that skin actually becomes more sensitive once it exceeds a certain moisture level, much like feet soaked in rain boots on a rainy day. Therefore, while this isn't an issue for healthy skin, it is said to be detrimental to sensitive skin as excessive moisture can break down the skin barrier. I hope this is something to keep in mind.