getting value between dates in pivot table...

I've got some data from our shop floor program that shows transaction/clocking dates...but i need to find the total dwell time at each operation.

The data looks like this:

Machine #1: 12/1/15
Machine #1: 12/2/15
Machine #1: 12/8/15
Machine #2: 12/8/15
Machine #2: 12/10/15

Since i'm pulling multiple reports, i'm looking for a faster way of getting this info pulled, as opposed to looking at the first/last date of each operation

any ideas how i can manipulate this info?

Here's some sample data...

Basically, we've got multiple clocking punches at each operation due to different shifts and the days it takes to complete each task. What I'm trying to do is figure out the total time at each operation so I can see where the 'bottlenecks' are...unfortunately, our system only allows me to run 1 work order summary at a time, and the only way I know how to do this is a manual insertion of a formula or modifying the spreadsheet to include a 'start date' and 'end date' column for a pivot table...either way I've got to do some manual work with each report I pull

I appreciate the breakdown...but is there a way to showcase the time it takes in days from the raw data? The dwell time at each operation is what I need to be able to pull. I know I can do that manually, but I was wondering if it was possible v

Here you go...sample is to the left of the original data.

Awesome! That's exactly what I need!