Weekly summary emails are sent only to those individuals with project admin credentials. By default, weekly summaries are sent at 4:30pm (based on the project's time zone) on Fridays. You can turn on, off, or edit a daily summary send day or time via the Project Details - Notifications screen on the web app. You can also edit a project's timezone via Project Details - Settings.
A weekly summary email may contain the following (click on the hyperlinked words for more information):
Click here to learn more about Notifications