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What is the largest file transfer you have ever done?
(startrek.website)
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Not looking at the man page, but I expect you can limit it if you want and the parser for the parameter knows about these names. If it were me it'd be one parser for byte size values and it'd work for chunk size and limit and sync interval and whatever else dd does.
Also probably limited by the size of the number tracking. I think dd reports the number of bytes copied at the end even in unlimited mode.