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I'm afraid only recurring invoices (as opposed to one-off ones) can be scheduled in such a way at the moment.
We have a Help Centre article that explains how to set up a recurring scheduled invoice. This might be of use to you if If you've previously invoiced your client and want to invoice them again for the same amount etc at a scheduled time.
If this is the case you could technically schedule a one-off invoice by going through the same process documented in the article, but setting the end date accordingly so only one is sent out.
Hope this is of some help to you - thanks for the helpful feedback.
