Scheduling Data Gathering Tasks can be done from the Task Scheduling option of Exchange Reporter Plus.
Mailbox Properties will be gathered from all the Exchange Servers selected.
To schedule a New Mailbox Permissions Gathering Task
Click on Admin Tab → Task Scheduling → Schedule New Task
Provide a Schedule Name.
Select Mailbox Permission from the Gathering Tasks drop down.
Select the Schedule Type.
Select the Time.
Click on the Add button against Data Sources
This will schedule a Mailbox Permission Gathering Task.
A scheduled tasks gathers data only from one Exchange Organization. Any number of Mailbox Permission Gatherings can be scheduled.