A person is active if they have not bounced or been unsubscribed. If either of these things have happened, they will be marked as Inactive and they can no longer be surveyed.
Active
Number of times surveyed
4
Last surveyed
Oct 21, 2014 – 11:56:01 am
Can be surveyed again
This is the next time this person will be eligible for surveying given your current Throttling settings and the last time they were surveyed.