By default, Marketo reports are limited to a maximum of 5,000 rows, but you can change that limit.
1. Go to the Marketing Activities area.
2. Select your report from the navigation tree and click the Setup tab.
Double-click Export Rows Available.
3. Select the new limit.
Changing the limit changes the report size itself, not just the exported Excel file, so if your report is taking too long to generate, reduce the limit!