1. What industry you are in - If you are a publishing site, your revenue comes from the top-ranking pages. You have to optimize content again in 6 months.
Ex: If you optimize in March, re-optimize it again in Sept.
But if you're in B2B or SaaS, it can take place in 2 months.
2. How much content you publish monthly - Most sites publish 4-5 content a month, so their optimization takes place every month based on the content performance.
But the publishing sites publish 3-4 content a day. So we have to schedule content optimization every 3-4 months.