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what is the shortest possible number of in game days to legitimately beat this game?
In other words, not a speed run. Main quests done, all major areas of the city and surrounding areas explored etc. I suspect the simpler characters would be best for this. Kensais with throwing weapons, an archer or two, a cleric/mage and skald. Optional sorcerer, and I think wand of monster summoning with it's 50 charges is absolutely essential to keeping combat painless enough to be managed by rings of regeneration.