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Experienced Python developers typically learn FastAPI in 1-2 weeks; Rails takes 3-4 weeks."},{"question":"Which is better for startups?","answer":"Rails typically wins for startups with small teams needing rapid MVP delivery (<4 weeks) and full-stack monoliths. FastAPI wins for startups building API platforms, data services, or planning multi-team microservices from day one. Rails' scaffolding saves weeks; FastAPI's scalability reduces infrastructure costs at higher scale (1000s of requests/second). 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