Didn't they change the cache TTL to 5 minutes earlier this year? So depending on exact timing it could potentially be invalidated between the updates.

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maxbond 20 minutes ago | parent [-]

It's an hour. It'll tell you the expiry time on the status line now but that information is also available in /usage.

	▲	buzer 17 minutes ago \| parent [-]
		https://github.com/anthropics/claude-code/issues/46829 Looks like what I remembered was a bug.