How many times would it be acceptable to “repeat stuff”? Say in a day. A loved one is very ill, perhaps. You wish them peace. How many times could that prayer be repeated in, say a day?
I’m talking here about repeating written words over and over again. Some things are just that, words. Pray from your heart. Pray them often or as often as you wish. Just praying words by rote is vain repetition.