https://phys.org/news/2018-10-reveals-psychological-online.html

For example, the sooner customers post a review the more they 'zoom-in' on their experience, focusing on the more concrete aspects, even on small details, and the more negative they are. As the time increases, reviewers 'zoom-out' and have a more positive view, focussing instead on the general experience and more abstract aspects.

With services such as hotels—the focus of this study—the geographical distance between the hotel and visitor's country of residence, and the cultural distance between the countries also influence how they rate their experience.