Official Strategy Guide
Location
Required Items
Rewards
What the allowance actually buys
One allowance here buys 595,710 EXP, the best of the 3 Lv 62 Alchemist tradecraft leves that record EXP: the runner-up manages 376,880 EXP, 37% less.
Across that rung the return runs from 257,640 EXP to 595,710 EXP per allowance — 3 distinct figures spanning 131%, so the wrong pick leaves 338,070 EXP of the allowance unspent.
On whether to wait: the best Lv 64 Alchemist tradecraft leve returns 379,020 EXP per allowance, 36% less than the best on this rung, while the Lv 60 rung behind tops out at 812,920 EXP.
At Lv 62 this data holds 27 leves paying EXP across 2 categories: the 24 Tradecraft ones average 417,590 EXP per allowance, the 3 Fieldcraft ones 1,118,055 EXP, which puts this leve 43% above its own category's average.
Gyuki Leather Codex ×1 is a Lv 62 Alchemist recipe, 3 steps deep through 5 intermediates, costing 26 units of raw material and 24 crystals.
Handing that in returns 22,912 EXP and 106 gil for every unit of raw material the order swallows, and the tree needs Alchemist, Carpenter, Goldsmith and Leatherworker.