Fix duration serialization

[tatethurston]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 33.27%. Comparing base (200cca4) to head (17c1951).

Files with missing lines	Patch %	Lines
...ages/protoscript/src/codegen/autogenerate/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
- Coverage   33.33%   33.27%   -0.06%     
==========================================
  Files           8        8              
  Lines        2241     2239       -2     
  Branches      775      773       -2     
==========================================
- Hits          747      745       -2     
  Misses       1494     1494              

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