Hello!
I'm not sure this is 100% reproducable, doing so 2 times was more than enough for me:
If I start fighting a monster and then, during the fight, start running backwards (e.g. because it turns out it's beating the crap out of me and I don't want to waste time on turning around), I fall off the edge of the world and die, after... uh... if I had to approximate, I'd say it's about 5-10 meters (assuming a dwarf is about 1-1.5 meters high).
Btw. would it be possible to not be transported to the realm of death after falling off the edge of the world, but some safe location instead? Even Hanquist would be better, would at least save the trouble of running through the whole rod...