Storgage calculation for KV

I am wondering about the calculation of KV.
If I store 1GB data in KV with one hour expiration {expirationTtl:3600}. How many usage of KV in my monthly bill? Is that usage for 1GB or 1GB/30days/24hours (0.001388GB)?


I believe so, but I would need to have a confirmation, as I am not sure how often the storage is calculated.