shelf life

I've been cooking my cannabis lately instead of smoking or vaping, and have settled on 1/2oz of high grade bud per 1/2 cup of coconut oil made into oatmeal raisin cookies with .25g per cookie. Three per day keeps me good all day long. Instead of having to cook so often I made a batch of 112...

So I'm curious if anyone has any experience with the length of time concentrates will stay good for? I know personally I've kept concentrates in sealed containers in dark dry places for say 3-4 months with no noticeable drop in quality, but that's as long as I've ever had them last before they...