Otoshiana no Jutsu [edited]

Name: Otoshiana No Jutsu (Pitfall Jutsu)
Rank: D (technique becomes stronger through training to B-rank)
Element: None (usually Earth)
Skill: Genjtusu
Range: medium at D-C, long at B
Description: Despite the name, the jutsu does not actually create a pitfall. Rather, it creates the appearance of a pitfall to stall the opponent. The name helps with the illusion that the user has created a giant hole in the earth between him or her and the opponent. The illusion can stay for two posts at the maximum while the user runs away, but only if the user is skilled enough to do so without fully concentrating. If a B-ranked ninja gives his jutsu a burst of chakra before running, the genjutsu will stay active on its own for two posts while the nin runs away, but after the nin goes farther than a hundred feet, he no longer controls the jutsu.
Chakra use: 5; (if B-ranked and sentient): 20

what is the range that you can run away and the jutsu still be active, and when will it disappear?

It can only stick around after the user leaves based on how much chakra you put into the genjutsu, with a maximum of two posts, and it can only stick around when it's B-ranked. Really, the ninja can run as far as he/she wants from the jutsu, and it'll still be active unless the opponent knows that it isn't a genjutsu, for whatever reason.

hmm... I'd say approved!