Hi AbdulkareemAlhassni. Welcome to the forum.
The first thought that comes to mind is something like this.
Formula:
=IF((TODAY()>=Start Date)*(TODAY()<=End Date),SUMPRODUCT(--(TODAY()>=Start Date),--(TODAY()<=End Date),Days/Weight),"Not Tracked")
Without an uploaded sample workbook I can not say for sure. The description is a bit vague (definitions of named ranges, etc.)
You almost always benefit by uploading a workbook.
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