Acacia Lumber

Nothing in this list is craftable in turn, so one Acacia Lumber is a single step: 5 units of material drawn from a single base item, plus 8 crystals.

That bill outweighs 4,201 of the 13,602 recipes tracked here and 464 of the 1,552 Carpenter ones, and 9,374 recipes nest deeper.

Its single raw material is gathered, and no spot for it is timed, so nothing in the tree waits on the Eorzean clock.

Acacia Lumber is itself consumed by 34 further recipes, spanning four of the eight crafting classes.