To better support compliance & audit regulations and to meet the growing needs of our users, the maximum retention period for LTS Log Streams has been extended from 30 days to 365 days. By default, the log retention period remains set at 30 days. You can manually adjust this setting to extend the retention period up to 365 days based on your requirements, or by API or Terraform.
When configuring the retention periods, the LTS also support defining the retention period in the log group itself. When leaving the retention period empty in the associated log streams the configuration is inherited from the parent group.
Find more details here: LTS Documentation, LTS API, LTS Terraform