'What is the billing for an aws s3 sync operation which makes no changes?

I have an aws s3 bucket with 10,000 files totally around 1GB in size.

I call:

aws s3 sync <remote bucket> <local folder> --exact-timestamps

And no files are found to be changed, so no actual file downloads take place.

However, there must be data exchange for the sync - does anyone know how much?

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