Seeing who has viewed the document?

Hi there, I'm wondering about the information displayed when I see who has viewed/signed the document.

Let's say I setup two signers for this document. After signer A signs, signer B gets a notification to countersign. 

I'm able to see when signer A or B has signed or viewed the document. But what happens if they view the document multiple times (before signing)? 

Does the date displayed show the date of the initial viewing, or the date of which they have most recently viewed?

Thank you for any insight!!