54 day rosary novena the Virgin Mary

Hi, I am not sure if this is the correct forum for this question, but I once heard that the 54 day rosary novena to the Virgin Mary could be condensed to 18 days if the person praying the novena prayed 15 decades a day instead of 5 decades. I was wondering this because what if someone really wanted to do this novena but had time constraints such as a surgery that was 30 days from now. Any advice would be greatly appreciated. - Thanks.

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