Don't Bore Me, Ore Me
Location
Required Items
Rewards
What the allowance actually buys
One allowance here buys 1,440,660 EXP — the identical figure every one of the 2 Lv 90 Armorer tradecraft leves pays, so on this rung the turn-in and the walk are the only things that actually differ.
On whether to wait: the best Lv 92 Armorer tradecraft leve returns 2,148,720 EXP per allowance, 49% more than the best on this rung, while the Lv 88 rung behind tops out at 2,257,300 EXP.
At Lv 90 this data holds 18 leves paying EXP across 2 categories: the 16 Tradecraft ones average 1,797,551 EXP per allowance, the 2 Fieldcraft ones 4,395,018 EXP, which puts this leve 20% below its own category's average.
Mountain Chromite Ingot ×3 is a Lv 91 Blacksmith recipe, a single step, costing 18 units of raw material and 24 crystals over 3 crafts.
Handing that in returns 80,037 EXP and 141 gil for every unit of raw material the order swallows.