Ref Post 5192 https://www.flyertalk.com/forum/37611053-post5192.html

Glad to report despite the Error Message on needing up to 72 hrs to verify, the miles posted to AA today with 02/23 redemption date and 02/24 posting date.

I think we can safely conclude for the time being AA batch processing deadline is Sunday, just dont wait till late evening Sunday to do the redemption.