30 minutes maybe for the intial review. Then 2 to 3 days to be posted.  That is if the language (details) to TER liking. Then it's changing,  adding more details to satisfy TER to get posted.  Took 2 weeks at least on one of mine.  I have never been contacted by anyone on a review to say thank you, etc. Well one did,  wanted me to change it to her likings.  That was many moons ago.

And I like to go over them a few times before I submit them, but generally, the process takes around 30-40 minutes or so. Some reviews get approved within 24-36 hours but that is rare. I would say the average is about 3 days or so.
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You are correct about the ability to go back 3 months to write one but I like things to be fresh in my mind so I tend to submit them 24-48 hours after the date, if I can.  
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15 days is the free VIP reward for having a review approved. Whitelisting is a nice gesture but doesn't carry any real weight like before with providers but it can help with a scant few. Being thanked is always appreciated. In addition, the lady allowing me to give her name as a reference can be a big help.

"IF" the TER Admin doesn't disagree with the ratings given,   It seems to be as much as 48 hours.  "IF" the TER Admin disagrees with the rating and there needs to be back and forth, it has taken up to a week.

If my session with you was great, I usually write a review in 1-3 days. Then, it can take 1-3 days for it to post.

 
However, if I plan to write a bad review, I wait a month or so. I used to write these right away too. However, I had a couple of providers write me angry emails and threaten me. By waiting a month, it's much harder for them to figure out who I am. I will also change some meaningless details to throw them off my scent. Like, I will write that she stroked my hair. I'm bald.

Recent reviews took (at least for me) almost a week.  I guess it all depends on how many of the TER-review staff are working.  Sometimes, I've gotten mine up within a day

Depends on the provider, the session, the vibe and what time I have available.

If it was a quickie, then the review is likely going to be a quick one.  The fastest I've ever done one is 20 minutes.  The process of posting a review can take a long time or not, depending on how familiar you are with it.

If the provider and I really clicked, then the review will be much longer, I will revise it a few times, and by the time I'm done it may take a few hours.  This will usually happen over a couple of days.

I tend to write long reviews, so it takes me a while to put it all together.  I try to write shorter, but I get sucked into the moment and relive it, remembering things.  Try to do it within a day or two so the details are fresh.  Takes arouind 3 days on average to post.

Whitelisting is a nice gesture, but I don't think it does that much.  Thank you's are always nice.  I've received a couple and it's nice that the time and effort is noticed.  Being forward and saying you would love to be a reference before I ask is a wonderful way to say thank you.

I really like the idea of waiting a while to post negative reviews.  Ran into the same issue with someone not happy about what I said.  Will still jot it down somewhere safe soon after the experience and just wait to upload it later.  Thanks for the idea!

I can do a Problem Report in 1 minute.  30 Problem Reports/30 minutes = 60 VIP days.  

 
If you write reviews primarily for the VIP days, do the math -  Problem Reports get me FOUR TIMES the VIP days you get by writing a review.

If I have a good session, I usually write and submit a review in 1-2 days. I don’t like to wait until I see another provider as things might get blurred. Also, the highlights are fresh in my mind. It takes me no more than 30 minutes to write the review. After I submit it, it takes 2-3 days to be posted. I usually go back at least once after I submit and before it is posted to make minor edits. I might find typo’s or remember additional details. I also delay weaker reviews a week or so to reduce the chance of retaliation.