Board Thread:Questions and Answers/@comment-26221691-20160312003057/@comment-1739368-20160312112726

I took a look at the Japanese wiki, and there doesn't appear to be any mention of official stand ranges. Only that Echoes Act 1's A-range is around 50 meters, while Echoes Act 3's C-Range is around 5 meters.

Realistically Id say A is 50+ and C is maybe 5-10.