I used a fresh battery and engaged session mode at 7.5. Took about 5 or 6 hits through my bong, and I heard the telltale shutoff buzz 11m20s later. My hits were not equally spread out during that time, so I think next time I'll start a separate timer from my last hit, in case the autoshutoff is somehow linked to that (very doubtful that there is a sensor to detect airflow, otherwise why not incorporate to counteract the effects of pulling before the buzz in on-demand mode?).
Starting it back up and I get 3 buzzes. I would try again but it has taken me about 15 extra minutes to remember to finish this post and not get distracted. this was fun though, Lime Bars is now one of my favorite indicas