Fate/Grand Order Hub on X: "Clarification on the pity system, after 329 summons, the 330th summon will be a guaranteed 5-star from that banner. This summon count will reset for every banner.
Genshin Impact Pity, Soft Pity, 50/50 and Epitomized Path system explained | Eurogamer.net
New Year 2022 - New Pity System : r/grandorder
Rate-Up SSR Pity System | Fate/Grand Order Wiki | Fandom