The max size of a CSV report in Heap varies based on where you download it from in your account. When you download a .csv file from the Users page, it will export the most recent 5,000 users who fit the criteria of the chart. When you download a .csv file from the Charts view, the export will show up to 100,000 rows of data per metric in your chart. There's no overall file size limit.
What is the max size of CSV exports?
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