Sorry for the delayed response. I answer posts in the order received, and active posts (unfortunately) keep gettting bumped to the top of the forum (and the bottom of my list).
That said, the first determination the court makes is whether the she is a dependent spouse and you are a supporting spouse. You look generally at gross income because one party could have significant deductions that the other party doesn’t (health care, 401(k), FSA, HSA, etc.). At first blush, the income disparity isn’t significant enough for me to believe that you have a dependent/supporting relationship. It would really depend on a more indepth look at how finances work in your house and whether you actually support her.
Then, the court looks to the factors detailed in the statute, the needs of the dependent spouse, and the ability of the supporting spouse to pay. There are no calculators in NC to utilize, and a dollar amount is impossible to pinpoint without looking at actual expenses. That said, if an order for alimony was allowed, the most I think you could expect would be an order that equalizes the income of the parties, and we generally see alimony lasting for about 1/2 the length of the marriage these days.
I hope that helps.