Boveda’s patented 2-way humidity control continually responds to ambient conditions by adding or removing moisture to affect the enclosed environment and deliver the pre-determined RH (relative humidity) level printed on the pack.
When Boveda is completely dry, it will turn into a solid wafer. It’s just short of this when there are very few soft spots left, that you’ll want to replace them.
Adding more than the minimum amount of humidity control packs recommended by Boveda is perfectly ok and in some cases required for dry climates, seasonality, or very leaky storage containers.
If your Boveda is being depleted quickly (less than 2 months) then you know that Boveda is working extra hard to keep that environment stable. The solution is to verify your humidor doesn’t need to be re-seasoned, or to add more Boveda packs.