"Respond within 24 business hours." Every support team has this commitment. It sounds like a simple timer. In practice, it's one of the most reliably buggy pieces of logic in a ticketing system. Let's look at what "24 business hours" actually means, why naive implementations fail, and how to build a CLI tool that gets it right. What "24 Business Hours" Actually Means If a ticket arrives at 3pm on a Friday, "24 business hours" does not mean Saturday at 3pm.