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Go for at least 6 months, but based on a few things.
In the initial 3 months, what has the agency done for you strategically and planned?
Also, you need to have some idea about the current stats of your website. As you have mentioned that a few keywords are on 50 – 70, which means there has been some work done. You need to look for other things like that, not in terms of performance or results, but just to have an idea that things are moving, the agency is working, and it is okay to have them for another 3 months.
