Previously, Spotlight could optionally retain clipboard contents for up to eight hours, but the latest update expands that flexibility with three options – 30 minutes, 8 hours, or 7 days. There’s also a new “Clear Clipboard History” button in System Settings ➝ Spotlight, giving users the ability to manually wipe stored clipboard data without having to wipe Spotlight search history wholesale.
Clearly, Apple heard the feedback from power users that 8 hours wasn’t enough.