How Do You Study for WGU With Limited Free Time?

Between work, errands, and regular responsibilities, I often have only small periods of free time for studying. I searched for do my WGU class for me when I felt overwhelmed, but I want to use those short periods more effectively. I have started choosing one small WGU task for each free hour instead of trying to complete everything at once. What study routine works when you have very little free time?