Translation productivity. For the code-writing component (translating Rocq definitions and theorem statements into Lean), we draw on unverified software engineering productivity estimates. Published industry figures typically place productive output at 50–100 kLoC/person-year for a developer working in a familiar language and codebase (a range that likely already reflects AI-assisted workflows). We calibrated against internal time trials on lf-lean statements and cross-referenced with these published figures, adopting the upper end of the range (100 kLoC/year) to produce a conservative lower bound on human time. Since our Lean translation comprises approximately 25 kLoC, this yields an estimate of roughly 3 person-months for translation alone. We note this likely underestimates the true effort: Lean is less widely known than mainstream languages, the translation requires understanding both Rocq and Lean type theory, and the translator must make non-trivial design decisions about how to represent Rocq idioms in Lean.
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