Days between plan statuses formula help

Hi all,

I am working on a portfolio dashboard for front-line fundraisers, and management would like to see a widget that shows the average time between a proposal/solicitation is submitted and when the gift comes in. 

My thought is to use the days in most recent status with value filters of recent status = Submitted and the current status = Commitment. This way it is only looking at plans that had a solicitation that yielded a successful contribution. At the dashboard level, I have campaign filters that narrow this down to just this year's campaigns.  However, the result I'm getting is 5,380 days or more than 14 years!  

Do y'all have any suggestions for what may be going awry? Or maybe there is a better way to calculate this?

Thank you!