Uno Venova
Banned
That's good, they have a clear process in place that's visible for the customers and helps the employees.Sandwich place near me implemented the 15 minute rule years ago. Seems to work for them.
They have that last 15 minutes to allow you time to pick up an order you call in or to come in and make an order to eat somewhere else (they do allow you to make orders if you are already there but only for to go). Allows them to be sure they can start closing up at the time they close and they don't have people trying to keep them open longer so they can come pick up the food or hanging around taking a while eating before they leave. They've left it at that and haven't started creeping up the time like you propose here. But then you can see by their rules they're just trying to prevent people staying after they are closed or making an order they can't actually pick up before the place closes.
Not an unwritten rule that all customers are expected to be aware of.