Many sites don't publish reviews as soon as they are posted. When they do post the review, they enter the published date as the date the user submitted it. There is no way for us to "find" the review the day it was submitted. When we pull the review into our system, the date may appear as being pulled in late, when in actuality it was published to the review site after it was submitted.
As an Example, TripAdvisor states on its website:
"It usually takes 24-48 hours for reviews to be visible on our site. It may take up to several days if your review requires a closer look by our editors. This may happen if you attach a large number of photos to your review, or bend or break our review guidelines."
If you feel like this is not the case and believe there is an issue with reviews being pulled in, please submit a ticket to firstname.lastname@example.org.