Keep in mind also that 3 days is a Citibank thing that applies to everything they do, not just PayAll payments. Citibank give themselves a minimum of 3 days to do anything, and again, days means Mon-Fri working days only. If your statement date is nominally 14, then that means your payment due date is typically around 8-9 of each month. If you have DD setup for payment, then 3 days is required for that payment to clear and reappear as available credit on the card to fund the next month's Payall payment.
Let's say that your payment due date is 8, but 8 is a Friday. That payment won't actually clear and bolster your available credit on your card until the following Wednesday 13. Keep that in mind too because you're going to need that payment from the previous statement cleared and in your available credit to fund the next month's PayAll payment right after the statement is produced.