I forget off the top of my head which crop it was from Yakima Valley Hops (probably 2020), but at any rate, they were sealed when I got them. When dry hops were added, they had only been open the 2 weeks since the boil.
I read from some people you can get grassy flavors from hops after extended periods, with some people saying to keep it to a few days.
Some have said that their beer has been successful with like a week of dry hopping.
I just brewed a beer where I only did a single dry hop, and it was for 3...