Hello Patricia,

AWS S3 generally states that transition between storage classes happens one a day at midnight UTC.
https://repost.aws/knowledge-center/s3-lifecycle-rule-delay

Usually it rarely takes more than 48 hours in order to fully transition data between storage classes.
Please note that lifecycle policies create via Backup solution can be applied to Backups. Other data that is not backup in the same container will not be moved to a different storage class. For bulk transition use Cloudberry Explorer tool or use native AWS console instead.

https://docs.aws.amazon.com/AmazonS3/latest/userguide/object-lifecycle-mgmt.html