How long does it take to go from no six-pack to a six pack if a person works hard?

I’m gonna start Ab Ripper X program. Currently I have no six pack (because I don’t do any ab exercises relative to my upper and lower body workouts), so how many months/weeks should it take for me to get a noticeable six-pack if I work hard?

For those who were in a similar position, how long did it take you to notice a six-pack?

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