You can control the hours of the day during which you want (or don't want) review requests to be sent. By setting send hours, you can ensure contacts don't receive review requests or reminders automatically during certain hours, for example late at night.

To update your send hours, click to the Campaigns section of your dashboard, then click on the General Settings menu:

Scroll down to the Schedule Settings section, you can change the time during which campaigns are allowed to send, using the Allow campaigns/reminders to send on/between settings:

Make sure to hit "Publish" at the top to make any campaigns changes live for future review requests!