Herk math in 2022, swear to god
12 lives (11 resurrections) -> killed 6 times by Archer -> 6 lives (5 resurrections) -> killed 1 time by Rin -> 5 lives (4 resurrections) -> overkilled 7 times by Caliburn -> -2 lives (no rez)
The only tricky thing to keep in mind is that God Hand = 11 resurrections + Herk's original life. Lives regen doesn't matter in the VN because he either loses them all in one day or get killed so much the regen wouldn't matter. At any rate the timeframe is something cooked up with an anime-specific cause (even though it doesn't matter there either):
It's more to emphasise that Illya is the sugoiest Master.Why was Heracles unscathed even after getting hit by Archer's A-rank Noble Phantasm, Caladbolg? He couldn't have nullified it, so did he just endure the full brunt of the attack?
N: Oh, that. In the original work, it was like "Even though none of the attacks up until then had been worth dodging, that one alone would be fatal so Berserker intercepted it, and there was catastrophic damage from the explosion."
In the anime, on the other hand, Berserker couldn't respond due to the fatal wound he had taken from Saber, so he took the attack head-on, lost another life, and regenerated. So he lost two lives in total.
T: Ah, so that's why God Hand needed three days to regenerate in the anime version!
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That said, there is another interpretation of this:
VN -> Lost one life, regenerated in ? days
Anime -> Lost two lives, regenerated in 3 days instead
Which considering the awkwardness of straight-up division might indicate that it's a total lives stock regen that takes more time relative to the lives lost?