The Dotted Line
Location
Required Items
Rewards
What the allowance actually buys
One allowance here buys 379,020 EXP, the best on the Lv 64 Alchemist tradecraft rung — matched exactly by 1 other leve of the 3 there, with the rest trailing at 259,100 EXP or less.
On whether to wait: the best Lv 66 Alchemist tradecraft leve returns 625,040 EXP per allowance, 65% more than the best on this rung, while the Lv 62 rung behind tops out at 595,710 EXP.
At Lv 64 this data holds 27 leves paying EXP across 2 categories: the 24 Tradecraft ones average 435,661 EXP per allowance, the 3 Fieldcraft ones 1,139,405 EXP, which puts this leve 13% below its own category's average.
Enchanted Durium Ink ×1 is a Lv 64 Alchemist recipe, 2 steps deep through 1 intermediate, costing 9 units of raw material and 11 crystals.
Handing that in returns 42,113 EXP and 166 gil for every unit of raw material the order swallows, and the tree needs Alchemist and Culinarian.