Reporting - TTF & Time To Approve

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Hi - 

Just to confirm...when creating a TTF report (from when it was approved to when it was filled), what fields should I use?

I'm thinking I would use the following:

Requisitions:

"Opened Date"

Requisition Candidates:

"Hired Date"

Then I would create an expression to give the time from "Opened Date" to "Hired Date"...correct?

 

To calculate the time it take to approve a req., what fields would I use to calculate when it was submitted for approval and when it was actually approved?

Sorry for the questions....there are so many fields to choose from. I just want to make sure I'm using the correct ones.