It all depends on the strain, some have a bigger self life than others
Bluebery and nl can be stored for 6 months + without loosing potency, try doing that to a lowryder though and all you smoke is dust
If the weed is sticky from the resin it should still crumble and have no added weight by water ie it should be dry all arround and sticky close to the stalk
Amsterdam weed has been fast dried and is cured for a max of 2 weeks and if that, only a couple of coffeshops have proper cured weed: grey area and bluebird from my experience