What team fastest 4x400 relay high school?

There isn't a single, universally maintained record for the fastest high school 4x400m relay. High school athletic records are often kept at the state or national federation level (like the NFHS in the US), and even then, records are constantly being broken.

To find the fastest time, you'd need to specify:

* Year: Records are updated annually.

* State/Country: The fastest time in California will likely be different from the fastest time in Texas or Kenya.

* Governing Body: Which athletic association are you referencing (e.g., NFHS, a specific state association)?

If you can provide this information, it might be possible to find the answer through that association's website or record books.