My boveda packs typically last a couple months in my humidor. I just have 2 sets. Onefor the humidor and one to recharge.I only have a 50ct desktop humidor and I keep 3 packs in it, so it is cheap enough to have 6 boveda packs.

I just swapped them around last night actually. The ones that were recharging were more plump than a brand new one.