Following the survey common settings and common options, there is a field named "Maximum number of invitations to send during 1 day per survey". This setting gives an opportunity to customize how many invites can be sent, in one day.
For example, you import files consisting of 10000 records. In the settings, you have a specified value of 500. In this case, the import takes random 500 records, or the records by "Invite priority" - link to the Invite priority article, and all these records will be invited. On the next day the same process, records will not be programmed for the future, they will be used randomly.
You can easily configure it to your needs.
If you have any additional questions, our Support Team will help you with joy.