My own supplies have dwindled to a mere hint of thickening by the weekend dust. If it wasn't for my grinder I would never experience such heady delights once a month or so...but in the pipe, the magic stuff goes up ever so quickly. Better in a small J.
How long is the kief good for???
I imagine I would get a far quicker and thicker build-up were I back in the Uk, for all thew bud I used to buy there was covered in crystals. Here in Australia, its a very rare occurrence, yet I know the weed I get is of at least a decent standard by Aussie measures for others I know, toke the same smoke. Its what is leading to me to ponder growing my own...but lots of work and chemicals and care would likely be required and also, its not yet quite legal here.
Something to do with oxidization...the THC will turn into CBN
"Cannabinol or CBN is an oxidative degradation product of THC. It may result from improper storage or curing and extensive processing, such as when making concentrates. It may also be an indicator of overall age of a dried flower product.
CBN has some psychoactvity, but it is less than THC. The cannabinoid receptors in the brain do not have as much affinity for CBN as they do for THC, thus the lesser effect.
CBN is thought by some researchers to enhance the dizziness and disorientation some users of cannabis experience"