The Wolfram Alpha calculator spits out ~14,393,400 damage at the top range to do exactly 25,000 modified damage, which is exactly what Hodgman's HP is. At 5 damage per turn of Salamanderenity, that's...2,878,680 turns = ~87,232 casts = ~436,165 MP. D:
Post-Frosty is much more reasonable, with ~195,601 damage needed = ~39,121 turns = ~1,186 casts = ~5,930 MP, but post-Frosty wouldn't be feasible for a hamster run...
Something tells me that less-MP-to-use-skills enchants would really help, though!