@Paul41 Airbnb support has given different people different answers about when the review time closes.
I myself do not know definitely how it works, but I did test it one time.
For a guest that checked out on a Saturday, I had until the Saturday 14 days afterwards, and for me the review window closed at 3 pm my local time.
Note that my check-in time starts at 3 pm, so I don't know if that has anything to do with it.
Also I don't know if the review window is sensitive to your local time zone. (Meaning, maybe it closes at 3 pm Pacific Time, so it would close at 6 pm Eastern Time.) (Or maybe it closes at 3 pm Eastern time. Or maybe at your check-in time. Who knows?)