They last about 2-3 months..That pile pictured in my RAD thread will keep me supplied into next summer so I wont need to order anything.
Well, I tell myself that but then seem to find some reason to place an order anyway!
Like this thought I just had:
"Geez, I only have about 1 oz of Brown Bogie on hand. I should really lay up a 500g pack for next year to see how it ages"