Fix cache native queries not working (underlying problem is unit conversion...

Fix cache native queries not working (underlying problem is unit conversion actually) (18160) (#18230)

Cache TTL is defined in the nice new column things as per hour. The actual cache wanted it in seconds. There wasn't a conversion hours->secs before, which was the underlying illusion that gave rise to #18160 - with a properly set cache ttl the cache works fine. But the cache ttl's weren't getting set to proper values because of that lack of unit conversion. So here's the conversion, hours->secs.