lucy24 - 9:58 am on Jul 13, 2013 (gmt 0)
What does Google infer about "quality" from that 15-second one-page visit?
Google infers that its Knowledge Thingummy* needs more work, because anything that can be answered in a fifteen-second visit can be answered by the search engine itself without ever leaving the SERP.
* Uhm. Senior Moment here.