Crofter's Wain

Taken all the way down to base materials, one Crofter's Wain is 3 crafting steps deep and needs 3 intermediates — Ash Lumber ×4, Bronze Rivets ×2 and Bronze Ingot ×2 — which resolve to 3 distinct raw materials totalling 18 units, plus 10 crystals.

That bill outweighs 7,380 of the 13,602 recipes tracked here and 740 of the 1,552 Carpenter ones, and 337 recipes nest deeper.

Only 2 of those crystals go into the final step; the other 8 are burned by the intermediates, so the real crystal cost is 5 Wind Shard, 4 Fire Shard and 1 Ice Shard.

The chain crosses two disciplines — Carpenter to Lv 14 and Blacksmith to Lv 3 — so no single class can finish it unaided.

All 3 raw materials are gathered, and not one of their spots is timed, so nothing in the tree waits on the Eorzean clock.

Of the intermediates, Bronze Ingot has the widest use: 76 recipes call for it, spanning six of the eight crafting classes.