Customer: “I think this feature works poorly in <edge case X>. Can you change it?”
Me: “Yes, I can see the problem, but I’m not sure what the correct behaviour in this case would be. This impacts financial processes, so you need to talk to <customer’s CFO> and get his input on how it should work.”
Customer: “OK, I’ll talk to him. But first, can you tell me how long it’ll take you to fix this?”
No, sorry, it’s only 8 AM, we are not allowed to violate the laws of causality until 5 PM.