How do I change the delay of 'Mark as Read' in Mail 8.1?

[iMore Question]

Change 'Mark as Read' Delay, in Mail 8.1

In Mail 8.1 (Yosemite), how do I change the delay of the "Mark as Read" behaviour?
Thank you!

 

[kch50428]

Re: Change 'Mark as Read' Delay, in Mail 8.1

I don't know that you can... Apple - Feedback