I’m not sure there are any formal rules for praying Novenas, other then the ones approved for private use.
I do have a Novenas book to different Saints and devotions. For example, some Novenas might have you pray an introductory prayer, then the actual Novena prayer for the day. Others might have you pray 1 Our Father, 1 Hail Mary, and 1 Glory Be (or any different combinations) after the actual Novena prayer. You might have one Novena prayer that is repeated once every day, or even once every hour for a total of nine hours.
I suppose it just depends on kind of Novena you are praying.
There are also a novena of 9 first Fridays of the month to the Sacred Heart.
And a novena of 9 first Saturdays of the month to Mary. This might be 5, I’m not sure.
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