I looked it up one time because I was curious and from what I found ZZZ's pity starts after you blow through 5 10-rolls. That's 8000 polychromes down the drain every time. The pity does carry over from banner to banner which is nice.

Needless to say, I still don't have any dupes for any of my S-rank agents...

ZeroFiveSeven said in comment #2633274:

I looked it up one time because I was curious and from what I found ZZZ's pity starts after you blow through 5 10-rolls. That's 8000 polychromes down the drain every time. The pity does carry over from banner to banner which is nice.

Needless to say, I still don't have any dupes for any of my S-rank agents...

I can relate to that. Outside of permanent banner agents, I have only one S rank that isn't in M0. It's Burnice, M1.