It Will Knock Your Socks Off

One allowance here buys 421,420 EXP, which places it 3rd of the 3 Lv 58 Leatherworker tradecraft leves that record EXP. The best of them, Starting Off on the Wrong Foot, returns 593,380 EXP for the same allowance, 41% more.

Across that rung the return runs from 421,420 EXP to 593,380 EXP per allowance — 3 distinct figures spanning 41%, so the wrong pick leaves 171,960 EXP of the allowance unspent.

On whether to wait: the best Lv 60 Leatherworker tradecraft leve returns 703,720 EXP per allowance, 19% more than the best on this rung, while the Lv 56 rung behind tops out at 534,960 EXP.

At Lv 58 this data holds 54 leves paying EXP across 3 categories: the 24 Tradecraft ones average 443,090 EXP per allowance, the 3 Fieldcraft ones 1,079,567 EXP and the 27 Grand Company ones 228,371 EXP, which puts this leve 5% below its own category's average.

Serpentskin Thighboots of Casting ×1 is a Lv 59 Leatherworker recipe, 4 steps deep through 10 intermediates, costing 38 units of raw material and 50 crystals.

Handing that in returns 11,090 EXP and 11 gil for every unit of raw material the order swallows, and the tree needs Alchemist, Blacksmith, Leatherworker and Weaver.

The record carries a repeats value of 2. This site reads that as 2 further turn-ins on the same leve — an assumption, because the source data defines no meaning for the field — which would put the ceiling at 1,264,260 EXP and 1,284 gil for the 1 allowance it costs, or 1,264,260 EXP per allowance.