Notification - Reminder at 30 day from specific field


I would like to see up reminder notifications - this is one example - at different milestones. I have not really utilized "when date is reached" before. In the example above, if I set it to run once, will this apply to each line item when the date is 30 days from the target completion date?

This spreadsheet has many lines so I want to make sure the notification is only sent one time per line.

Thank you in advance!

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