My understanding is the time adds on if you have more than one approved review.
For example, if you have two approved reviews you have 8 weeks of private detail access from the point your first review was approved. Now if you get a third one approved it will extend your time out for an additinal 4 weeks and so on.
Unlike on Spa Hunters that fostered a huge number of lurkers, this gives incentive for member's review participation.
Top Jimmy said somewhere that he was considering situations where other participation may be looked at to continue private detail access too.
One thing I know for sure is a review must have private detail information in it or it will not get approved. This should eliminate all of these short and fake reviews once new members catch on that their review was never approved. For legit shops or those with limited extras just say someting simple to tha affect in the private detail section.
If you see this thread, Top Jimmy, please weigh in and provide us additional to help understand the review process.