How do you get humans to stay on a site 10 to 30 seconds? Some may leave immediately, others' computers may crash during the first second and some others may find the content so interesting that they stay an hour. That doesn't sound very human, it sounds kind of unrealistic and automated.
Can you explain your statistics?
And besides, what's the point of humans who are on a site between 10 and 30 seconds? They can't browse, check out, and send payment within half a minute anyway.
