Level 39. This is completely based on how many HPs you can max out to make this efficient. Fungi tunic before this is also efficient as well at cutting down med time.
CH costs 400 mana and manastone gives 20 mana for every 60 hp.
To break even on CH mana (not including saves for specialize alteration) you need 20 clicks, which is 400 mana and takes 1200 hp.
If you can do 1261 hp (1 extra click over break even + 1hp to stay alive), then you get 420 mana back total; however, you could easily med that 20 mana back in the ~15 seconds it takes to stone + CH.
Bump up to 2000 hp, and you can get 33 clicks for a total of 1980 hp or 660 mana for a net gain of 260 mana.
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