This is kind of a sad troll effort, but I'll answer for the sake of anyone who might read this thread and actually need the correct answer. You're actually talking about two different things: First, there is the question of what is the slowest pace that can be considered running? It's been well-established for decades that 7 minute pace and faster is running, anything slower is not. Separate from this is the question of how slow someone can "run" given the parameters you lay out above. With the understanding that this wouldn't really be running (as we've already stated, anything slower than 7 minute pace is walking), but rather a walking style where both feet leave the ground, but in an effort to humor you, I would say that the answer would clearly be 10 minute pace.