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Unfortunately, there's no direct way to do that at the moment. Use Help->Send Feedback to send in your request for richer support for repeating items (like the ability to have them stop after so many repeats, or after a specific date).

In the mean time, you can try one of the following approaches:

Set up to repeat as usual, but also enter a separate action (with appropriate start and due dates) to remind you to stop the repeating action (or maybe just put a note in the action title -- "Take antibiotic each morning until Jan. 23"

Make a list of however many copies of the repeating item you need in a text editor, one per line. Then paste the whole bunch into OmniFocus (be sure to select the row handle or dot to the left of the line where you're pasting, or you'll just get one multi-line action, not what you want!) and set the start and due dates for each action. This would probably be easier with a script to do the date processing, and wouldn't be too difficult a starter project if you wanted to learn some Applescript.