Fate/Grand Order part 1840: Advanced Quest Part 3 - Bone Shattering (3T clear) 

The last of this batch of Advanced Quests features Darius III and infinitely spawning skeleton enemies. Darius has MANY charges of damage resistance, which get removed each time you defeat a skeleton. This fight uses the 6 enemy formation, making it super easy to NP loop. I don't know if 3 turns is necessarily the minimum, but I can certainly say it's the most reasonable goal for a veteran to set. As a side note, bringing Iskandar, Alexander, or Hephaestion will give your party a max HP increase. But I think they have to be on the field for it to be applied.
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