I see some minutes in difference the export goes some more minutes in the past than cpview -t.
I assume it is because cpview -t was done some minutes after the export.
So I consider cpview -t has the same time window as cpview export.
I'm not able to see a full month on cpview -t.
I've done the export some minutes ago on a cluster and active unit has 7 days and 9 hours, stand-by unit has 9 days and 15 hours.
Also disk is not a problem since all partitions have free space, /var/log has almost 70G free space.
Memory should not be a problem, each unit has 16GB and more than half is free.
CPU could be an issue, because I see some spikes during the day, but it is only on the main unit, not the stand-by.
And last failover was on July 15, and last reboot was before that.