4 ms·

And you could copy paste Python version from SO and have it running in less than a minute, so here’s the winner :)

• bonzini 5y ago
  If the Python version is 2000 times slower, the breakeven would be after a few terabytes of FizzBuzz.
  • Qem 5y ago
    The Python version posted is about 85 MiB/sec, so only 600 times slower than the fastest one.
    • bonzini 5y ago
      Ah, forgot about pypy!
• DeathArrow 5y ago
  Yes, but if you start the Python version and still have 5 minutes left from the day, the C version will overtake Python.