How long for article to rank well from brand new site?

I have been following the "income school" method of niche site article writing and posted 30+ 1000-3000+ word articles all helping the "user experience" and following the SEO basics taught by Income School

After 8 months only one post is number one in Google and that was the worst post I wrote, a sort of "100 best snooker jokes" type post. (Gets 2000 per month but not very buyer intent is it).
The better posts are still nowhere. Might be a competitive niche, but KW finder didn't think so....

How long for article to rank well from brand new site?

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