There is no max size per-se - One will be limited by "reality" (time it takes to create an extract) before you hit max file size
Extracts are not limited in terms of # rows, either - the focus is on the number of unique values per column in the extract. I believe the limit is around 4.1B unique values per column - Unlikely you'll get close to this for even 1 column let alone 4.1B x "X columns".
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Size of your hard disk memory