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The only thing you should judge your SEO on is how much content he will create or optimize, and how many legit links he can establish to that content.
A good post takes 3 hours to create with multimedia assets, 30 mins to analyse, 1 hour to optimize, and can take anything from 30 mins to 6 hours to create a link to it.
I would start small. Get a company that works on 1 page per month, given the above, and then you can gauge if you want to proceed with them, and to what you can scale to.
