@JoshM
You have 14 days from the time ABB sends you the notification to review that guest or host. Since reviews are a double-blind system, meaning that neither is posted until both reviews are written OR the 14 days has passed. So waiting until the last minute IF the other person has NOT posted a review means that they can’t post one (that will most likely be negative as well) and your review stands. They may be able to reply to it, but I’m not sure about that.
Guests can leave retaliatory reviews. Meaning - say you book for 10 nights knowing you need that 11th night and you have a history of asking to pay for that night in cash instead of through ABB. (This really happened). You ask for that 11th night in cash when you walk in the door. Now some hosts may immediately say “Yes,” others will wait a couple of days to see how you are as a guest. Others will immediately say “No,” as I did with the 10 nighters a few years ago. The husband tried to bully me - every meal I ate at a table away from them, he’d ask. Every time I’d see them in the kitchen or in the hallway, he’d ask. I continued to say no. I sent him special rates via ABB Messenger and he’d refuse them. They were awful guests. And he was a bully.
Long story short, he left a polite and positive written review BUT dinged me on stars, with polite wording. He was also a host! So he knew that his retaliation for my not giving in to him might cost me Super Host status and would definitely bring down my average in points and possibly hurt my business.
I said they were better suited to a hotel or separate unit and dinged them on stars, too. I was fairly new and should have said “Guests were drunk before noon, rude, kept asking for another night in cash and wouldn’t stop asking even though it’s against ABB policy to do that.” AND I should have canceled them after Day 2 with an “I’m not comfortable with these guests,” citing the drinking, smoking outside, and requests for cash payment for the last night."
I’ve had 1 guest give me 5* for everything except a 4* for location because of Spring Break traffic even though they came from a Spring Break destination and were told about the traffic repeatedly in Messages and in person. I even bought organic coffee for her. 
I had another guest give me 4* for value because of the ABB Fees. When I told her afterwards that hosts don’t set fees and we also pay them, she was wildly apologetic.
Now I make sure to talk to new ABB guests about the review system (conversationally) and star rating system. They’re glad to know about it.
So, I’m waiting until 13 days and 58 minutes to post the review I have saved. Maybe the guest is doing the same, maybe not. But my review will have a bigger impact upon her as she only has 2 reviews as a guest and I have over 50 reviews as a host. Plus, I tried to cancel her before and during her stay, so I have a shot at getting hers removed. Maybe.
