DateDiff and Date Slicer

Hi, I am working in equipment utilization report. I need to calculate total number of dates btw my date column, based on the date slicer. So used Datediff as measure And utilization per day is Total hours / No. of days, where Total hours is Column and No. of Days is measure. Hence cannot use datediff measure in denominator. The utilization comes as infinity. Really helpful if someone gives valuable ideas.