Time period for blocking: This setting limits the number of posts students can make in a period of time. Choose the time period within which to block students from posting from the Time period for blocking drop-down menu.
Post threshold for blocking: If a time period for blocking has been set, this setting specifies the maximum number of posts which a user can post in the given time period.
Post threshold for warning: Students can be warned as they approach the maximum number of posts allowed in a given period. This setting specifies after how many posts they are warned.