Now we are going to edit the provider recurring events by changing his lunch from 2 hours to 1 hour.

Change the "duration from 120 min or 2 hours to "60" or 1 hour.

It is going to ask if you want to change "All", "Current" or "Future Events". I selected "All" and now ALL of the future lunch events are edited to 1 hour.

Now we are going to delete a recurring event. Double-click on the Event.

It is going to ask you if you want to delete all, future, or current lunch events. I clicked "All" and then you should notice that all of your provider lunch events have been deleted from your calendar

Editing and Deleting Recurring Calendar Events