Dutchy; Glass jars are the best way to store herbs, once they are completly dried. If there is still dampness then you must open jars for a few minuites everyday, until they are...Now longevity of potency starts to degrade at about a year, I believe...Haven't read up on that in a while, but I will be glad to re-research info for you when I get a couple minutes.
Now televisor mentioned the freezer. Well that just might work, but again all dampness needs to be drawn out of herbs until they are dry...I would use the same regimen as pollen storage...Jmo...Once herbs are completely dry...place loosely in paper bag in fridge to draw out whatever dampness is still in herbs...then place paper bags in freezer bags, or jars and freeze...Goodluck, I hope this helps.
p.s. I wouldn't know the math for 1 or 1/2 joint a day, I am probably at a 4-6 joint minimum my self...3lbs a year
and it is hard for me to sustain my stash through to the next cycle. peace