Limits when using personal Google Accounts
As a security measure, there are limits on certain activities and features in Classroom, such as how many classes you can create and class sizes. If you reach a limit, you’re prevented from the activity whose limit you reached.
The following limits apply for personal Google Accounts. To learn more about what type of account you have, see Sign in to Classroom. The value of these limits can change without notice in order to protect Google's infrastructure.
Classroom limits with a personal Google Account
|Activity or feature||Limit|
|Classes you can create||30 per day|
|Classes you can join||100 maximum, 30 per day|
|Class size (teachers and students)||250|
|Class-member invitations you can send||100 per class, per day|