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Craig Kimbrel (after a 20.2 IP cup the year before,with 40K) had 46 Saves/8BS, 127k, 77IP a full season of 1.64K/IP. I imagine it was probably Kimbrel that Diaz took the quickest to 50K record from, since he had 40 in just 20.2. #50 was @ 26IP vs Diaz @ 25.1IP. 2/3 of an inning is almost identical, so the precedent seems to be Kimbrel for starting out with basically 2k/IP in 20+ innings