Summary: Consensus anchor $300M–$1.0B/day (CBO 2019; S&P 2018). We show a working range ~$350M–$1.05B and a peak-day tail ~$1.2–$1.3B by adding reliability penalties, behavior, and small spread bumps. We cite CBO, GAO, USDOT, Treasury and show per-household math. Method notes: conservative, nonpartisan; we separate recoverable delays vs. non-substitutable activity. Happy to share the spreadsheets and discuss assumptions.