A google spreadsheet example of what I am trying to achieve can be found here: https://docs.google.com/spreadsheets/d/16x_2NFSyYreBsC0hFA3UuhCGmhZc8fvqtNpVwZn9SRw/edit?usp=sharing
In the above example, I am trying to find out the total number of days from ALL "Normal Ranges" that fall within the "Master Range" start/end.
Note: Please leave "Excel" tag as this is an excel question. I just made the google spreadsheet so that I could share easily with others.