Put the approval deadline in writing

If a post must be live Thursday at 10, the client needs the file early enough to read it, and you need time to apply notes. For many retainers that means Tuesday. Pick the offset and use it every week so it becomes boring.

Different formats need different offsets. A still with a known offer can move faster than a Reel that needs a product check. Do not use one fantasy number for both.

"End of day" means a different hour in every inbox. Say the time and the zone. A client in another city will miss a deadline that was only obvious in yours.

Put the due time on the item they open, not only in a Monday email. Emails get buried. The post sitting in their queue does not, if the queue is short.

Track how often the yes arrives after the internal cutoff. If it is rare, nudge. If it is the pattern, change the calendar or the rule about silence. Hoping harder is not an operations plan.

Do not punish the designer for a client who answers on publish day. The schedule was wrong, or the expectation was never sold.

Five approval emails in a day train the client to defer all of them. One batch, with a single due time, is easier to respect. They can still reject a single post inside the batch.

The batch needs a limit. A month dumped on a Friday afternoon is not a batch. It is an ambush.