Initiate's Grinding Wheel

Taken all the way down to base materials, one Initiate's Grinding Wheel is 2 crafting steps deep and needs 2 intermediates — Iron Ingot ×1 and Walnut Lumber ×1 — which resolve to 3 distinct raw materials totalling 7 units, plus 7 crystals.

That bill outweighs 4,963 of the 13,602 recipes tracked here and 509 of the 1,552 Carpenter ones, and 4,464 recipes nest deeper.

Only 4 of those crystals go into the final step; the other 3 are burned by the intermediates, so the real crystal cost is 4 Wind Shard, 2 Ice Shard and 1 Fire Shard.

The chain crosses two disciplines — Carpenter to Lv 25 and Blacksmith to Lv 16 — 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, Walnut Lumber has the widest use: 128 recipes call for it, spanning eight of the eight crafting classes.