Report never ready for download, always shows Pending

Hi guys,

When I have tried running the NDS tool my reports never become available to download.  The report processes okay but stays as Pending.  The current NDS report I am waiting on has been pending for 24 hours but I have previously attempted to run reports and waited 3 days without success.

I understand that the reports are sent to Cisco and we have to wait on them. Is there an SLA or guidelines around how long it will take for the report to be ready?  If so that will be much appreciated.