What is AFS1-TimedStorage-ByteHrs?

TimedStorage-ByteHrs is the amount of storage used by your DynamoDB tables and indexes, for tables with the Standard table class. Storage is calculated hourly but priced monthly as calculated from an average of the hourly charges. Although the storage UsageType uses ByteHrs as a suffix, storage usage in the CUR is measured in GB and priced by GB-month. DynamoDB measures the size of your billable data by adding the raw byte size of your data plus a per-item storage overhead that depends on the features you have enabled. Storage usage values in the CUR will be higher compared with the storage values when using DescribeTable, because DescribeTable does not include the per-item storage overhead.