The perfect dunk of an Oreo in skim milk is a personal problem, but, in case you are wondering, there is math for that.
Here's the answer: The perfect dunk is three seconds.
We know this rare fact because in 2016 three members of the Utah State University's Splash Lab tested Oreos.
They found that Oreos soak up 50 percent of their potential liquid weight in one second, according to Mental Floss. After two second, they soak up 80 percent. After four seconds, the Oreo soaks up all the milk it will ever soak. If you wait five minutes, a soaked Oreo will lose its shape and dissolve in the skim milk.
However, if you prefer a long dunk, use whole milk or heavy cream. The fat slows down absorption time.