Mine is around 15. I lost count.

Death, pano revive sound goes off. Bloodmage respawn. Death with pano revive sound again. Nebula respawn, death. 1st pano revive, death with pano sound. 2nd pano respawn, death with pano sound. This went on for another 6 or 7 times. I scrolled, died with pano respawn. Nebula bought scroll, pano respawn went off, died with pano sound, nebula revive, died instantly with another pano respawn. Etc, etc. You get the idea ^_^

Stacking revives with pano is pretty absurd. After this, I just took to switching into shadow hunter so my KDR didn't become quite so abysmal. That and people's reaction to pano respawn then suddenly facing a guy with invulnerability and dropping wards is pretty great.