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Scheduling a report to export as CSV and email to a recipient.

How many records can be exported using Export Details button in reports?

Well as per Salesforce Emailed reports can be up
to 10 MB.

You can find the details about limits here

wihtout Email : 

You can export up to 256 columns and 65,536 rows of data in one report.

Source :

 in Email 

limit is 3 MB for attachment size in email body