Timeline should not pause when i minimise the browser

Hi all, we need to kick a learner out of the course if they're not staying engaged. The use of the Slide.ElapsedTime built-in variable gets us really close to a workable timer. That is...we can display a warning message when they're getting close and then reset the Slide.ElapsedTime variable to 0 if they respond. But we're still stumbling to understand how to actually trigger the exit automation if the course has lost the focus (minimized or switched to another tab). It doesn't seem to fire until they come back to the course. And we don't want to continue logging time in the LMS until they switch back only to then kick them out. Any suggestions would be appreciated. Thanks!