I've always just grinded one of the 10-Stage Chain Challenges (the one with Ike and Veronica) in NM. I think around two whole rounds or less gets you to A-rank, but S-ranking seemed at least twice as much as much...
It's actually something good to know, if you're someone who tends to switch around some S-supports. I used to switch them a decent, but I finally settled with Sanaki.
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