Reduce Bounce Rate is a WordPress plugin to enable real Time On Site and Bounce Rate in Google Analytics.
Google Analytics calculates the Time On Site based on the length of time between a user entering your site and their last page view.
This plugin will tell Google Analytics every 10 seconds that your visitor is still on the page and it will also let Google know there was some interaction on the page.
This plugin makes use of Google’s Event Tracking API and is totally accepted by Google. The result are more accurate Time on Site and Bounce Rate statistics.