I want to know what is the minimum time required to soak oats to make them overnight oats. Now a days it’s Ramadan and I have very tight schedule on which I get 2-3 hours to eat.  I wanted to know how much time is minimum required for overnight oats?  
I learned, long ago, that when a recipe calls for "overnight" it means eight to ten hours and sometimes twelve. The range depends on what you are soaking. Sometimes eight is enough and sometimes longer is needed because the ingredients are a variable that may not be consistent.   So the oats need to be tested. If eight hours is enough then eight hours it is. If not, you need longer. 