I had wanted to do this, so hopefully it will be useful to the OP.
Manastone as used by me (50 dwarf cleric):
In theory:
1865hp/60hp =
31 clicks.
31 clicks x 20mana =
620 mana.
620 mana - 400 mana(ch) =
220 mana gained per cycle.
Time for one cycle (clicks + ch) =
rougly 30 seconds.
Total mana =
2091 (as equipped with above stats).
Amount of mana to med after final ch = 0.82 x 2091 =
1714 mana.
Number of cycles = 1714mana/240mana = 7.14 cycles.
This comes from 0% mana which is rare, so we'll round to
7 cycles.
7 cycles x 30 seconds = 3.5 minutes roughly, we'll call it 4 minutes.
+ another 3 minutes to get to FM meditating regularly =
roughly 7 minutes to FM.
Compared to roughly
13-14 minutes to med normally to full at 50 with my stats.
So in theory almost twice as fast with the caveat you have to actually participate in your mana regeneration and you might annoy people with spam!
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Empirical Evidence:
Regular Meditation
19:50:18 - Started meditating from 1% mana.
19:59:48 -
9 minutes 30 seconds to get to 82%.
20:01:53 -
11 minutes 35 seconds to get to FM.
Manastone Method
20:05:50 - Started meditating from 1% mana.
20:09:10 -
3 minutes 20 seconds to get to 82%.
20:11:05 -
5 minutes 15 seconds to get to FM.
Ratios/Conclusions
9.5m/3.33m =
2.85 times faster to 82% using manastone.
11.58m/5.25m =
2.2 times faster to full mana using manastone.
Can't use it in planes and you can't use it past classic (as I understand), but if you live for today and not tomorrow, it is definitely worth it as a cleric.