Jonae의 댓글

Went to pick up the recipe. Requires Revered, not Friendly with the Court of Harvesters.

Kimberly의 댓글

The contract lasts 7 days.

Whenever you complete a World Quest, you gain an extra 10 rep for the faction you have the contract active with. Even if you have a contract with Court of Harvesters and you complete a quest that normally rewards Court of Harvester rep, you still gain that extra 10 rep.

The cost to create this on my realm with buying cheap herbs/ink is about 100g. Not to mention the 1765g cost to buy the recipe from the vendor. I thought it would last longer.
Only lasting 7 days is not very long considering the gold investment you are making.

These contracts are only useful if you really are trying to grind rep with a certain faction quickly, and are going to go do a lot of World Quest during the 7 days, and need that tiny bit of extra rep to help you do so. Otherwise, its best to just skip these, unless you can sell them on the AH for a decent profit.