Horse Chestnut Spinning Wheel

Taken all the way down to base materials, one Horse Chestnut Spinning Wheel is 2 crafting steps deep and needs 2 intermediates — Horse Chestnut Lumber ×3 and High Durium Nugget ×1 — which resolve to 3 distinct raw materials totalling 21 units, plus 47 crystals.

That bill outweighs 8,152 of the 13,602 recipes tracked here and 815 of the 1,552 Carpenter ones, and 4,464 recipes nest deeper.

Only 15 of those crystals go into the final step; the other 32 are burned by the intermediates, so the real crystal cost is 32 Wind Crystal, 8 Fire Crystal and 7 Ice Crystal.

The chain crosses two disciplines — Carpenter to Lv 81 and Blacksmith to Lv 81 — 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, High Durium Nugget has the widest use: 87 recipes call for it, spanning five of the eight crafting classes.