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Your answer should be “forever.” Since content is the front line between a brand/product/project and its users, there should be a component of measurement and adjustment whereever content strategy is involved. And from there—and in a perfect world—the process should start again.
Okay, maybe “forever” is a bit strong. There is a belief that “good UX never ends” and the same can be said for good content strategy. However, with a good governance plan put into place—and an adherence to it—the effort can certainly become less over time. Grocki adds:
“I use the garden metaphor all the time. If you haven’t touched it in 5 years (or ever), it’s going to suck making it a functioning garden. Also, when the garden is finished, you’ll still have to tend and weed, but it won’t be nearly as impossible as the first time you worked on it.”