You can only review a provider once to get TER credit towards VIP I believe.  However, I don't agree with that.  If you are seeing the same girl and enjoying your time why would multiple reviews not be a good thing?

getting VIP credit for the review.  You may review a provider more than once, but it should be only to update with new information or changes since you wrote the first review.  I have always had a policy of reviewing a provider only once, unless something has changed in her appearance, menu, attitude or skills, whether it be for the better or worse.  Since the stated purpose of writing reviews is to help other members get the best bang for their buck (pun intended), and providers often go through periods of highs and lows like anyone else, updating a review for a session that was better or worse during a subsequent visit than your first visit is helpful to our fellow hobbyists.  

IMO, it should be if there is a change. Say I saw a provider and she was good and I had a good time. I see her again months later, and she is absolutely amazing, and seems to have improved. This wouldn't be reflected in my original review and would be a good reason to review her again. On the flip side, if there is a drop in service, looks, and anything else, again something has changed that was not reflected in my previous review. But if you saw her last month and are seeing her again, and it's all the same, it really makes no sense. Now this is someone just trying to get free VIP days.

My opinion is:
As many times as you want as long as the meeting took place.  
There is no exact same session ever.  
Been seeing one girl for 15 years twice a year every time she’s in town and every appointment was different. So yes you should be able to review same provider as many times as you want to write a new review of a new appointment.

"Shrill" describes a high-pitched, piercing sound or voice, while "shill" refers to a person who secretly promotes or endorses something for personal gain, often by pretending to be an impartial customer or enthusiast.  
You are welcome!

I would say for most providers that give a very consistent experience, once is usually enough.  I absolutely understand only giving credit for the first review of any provider, as repeated reviews usually don't add a whole lot and tend to be repetitive.

I have only reviewed one provider twice, and that is only because after multiple sessions with them I learned a lot more about what they are capable of, and that let me provide some additional context that differed a lot from my initial review.  I don't think the time between reviews is nearly as important as the potential change in content.  If your second review could be a carbon copy of the first, there is probably no need for a second review.

If your experience didn't change either score by two points  (up or down) the reviewer gave the first time, it probably doesn't add value.
One exception might be if she hasn't had ANY reviews in more than a year.  

I really didn't like any of the choices in the TER poll.

For those that worry about someone shilling and are not able to see that without someone helping TER could simply put a running sum on the review so everyone know how many times the reviewer reviewed the escort.  

 
I suppose they might also think about implementing some disincentive by putting some algorithm in that starts to reduce the VIP days for a first review once some repeat review threshold is hit (be that for a given provider or collectively).

the purpose of the reviews and the culture of the site.  There are sites that permit unlimited multiple reviews and readers can follow extended interactions and specific relationships over time.  Other sites are just checklists.  TER is somewhere in between and the ambiguity in frequency is probably healthy right now.  In general, more information is more useful, and repeated visits offer a specific and useful kind of information -- although the value of additional repeat info declines rapidly -- unless you're into reading serials.  So it's not just how frequently a reviewer may review, but how many reviewers will repeat.  

The magic isn’t the same twice

I think multiple reviews can actually be a wonderful thing — not because a gentleman should repeat the same details, but because chemistry evolves. A connection after the first date is often different from the third or the fifth, and it’s in those nuances where the real story is told.

For those of us who value building longer-term connections, it’s nice to see reviews reflect not just one encounter, but the journey of how two people’s comfort and passion can grow over time.