Workflow Rule -> Action of Email Notification is limited to 6 intervals

Workflow Rule -> Action of Email Notification is limited to 6 intervals

Hi,

I have created a Workflow Rule to send a reminder to course participants 1 hour before the start of the weekly session. 

Example: A training course will run for 1 hour between 8-9 pm every Monday for 12 weeks (total of 12 sessions).

Ref the attached screenshot for the Workflow created.

Howevr, there is no provision to create a Scheduled Action beyond the 6th session i.e. (Execute 35 day(s) AfterRule Trigger Time).

I need the Email Notification to be created/sent to participants till the last (12th) session i.e for another 6 sessions:
Execute 42 day(s) AfterRule Trigger Time  
Execute 49 day(s) AfterRule Trigger Time
Execute 56 day(s) AfterRule Trigger Time
Execute 63 day(s) AfterRule Trigger Time
Execute 70 day(s) AfterRule Trigger Time
Execute 77 day(s) AfterRule Trigger Time

Please assist.
Indo French Hub