Depending on type of search, time spent on the page might correlate with quality or it might correlate with how hard the page is to use. And those are both com

Depending on type of search, time spent on the page might correlate with quality or it might correlate with how hard the page is to use. And those are both common enough that yes it's very different. And I said it worries me, not that I'm confident google is using it wrong.