Review times can vary depending on the complexity and length of the material being reviewed, as well as the availability of the reviewer. Generally, a simple review can take a few hours to a day, while a more in-depth review may take several days to a week. It is important to communicate with the reviewer and set clear expectations for when the review will be completed. It is also helpful to provide all necessary information and materials to the reviewer in a timely manner to ensure a timely review process.