List Asynchronous Runs of a Report
You can get as many as 2000 instances of a report for which you requested asynchronous runs by sending a GET request to the Instances List resource. The instance list is sorted by the date when the run was requested. Report results are stored for a rolling 24-hour period. During this time, based on your user access level, you can access results for each instance of the report that was run.
A GET request, /services/data/v29.0/analytics/reports/00OD0000001ZbP7MAK/instances, to the Instances List resource returns two instances of the report that was run asynchronously. Each URL handle stores report results for that instance.
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