Time To Fill Subtracting Only Days On Hold Prior to Offer Accepted

Summary

Time to Fill - How to only subtract the days on hold between the two dates and not total days on hold for the life of the req.

Content

I'm trying to calculate time to fill between req approval date and offer accepted date.  When I subtract the Days on Hold, it gives negative numbers for those that may have accepted their offer prior to the req going on hold again after that.  In BO we had a formula to only calculate the days on hold between the two dates.  Does anyone know how to do this is OBI?  Using the below variable (only partial excerpt shown) only works if there is one set of on hold dates after the offer is accepted.  Thank you.