Whole bark lasts a lot longer than prepowered or even shredded.

I had 100g of whole bark that I stuck in a box when we moved and forgot about it for almost 2 years.  I was able to get almost a gram (850mgs) of recrystalized white shard spice off of it.

I highly suggest storing prepowdered bark in the fridge or even the freezer for storage longer than 2 months.