*Far out for roadmaps, not hippies. Although there is an overlap.
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How long into the future should your roadmap stretch? The answer depends on how fast you are learning. A start-up with new learning every week may have a roadmap of no more than a few months. An established product in a mature market may release features once each year, and will have a longer roadmap.
How far out does your organization's roadmap go? What's too long? What is too short? Does your roadmap have dates at all? See Chapter 9 of Product Roadmaps Relaunched.