few questions about Recipe

Hello,

I'm trying to get my head around the prepTime, cookTime, and totalTime
properties of Recipe. totalTime is defined as the time it takes to prepare
and cook the recipe, which sure sounds as if prepTime plus cookTime is
supposed to equal totalTime.

I don't know the recommended way to categorize a post-cooking "let sit for
about 10 minutes before slicing, then slice and serve" or post-baking
"transfer to rack and cool. Chill until cold, about 2 hours. Cover and
chill overnight." Are there more detailed guidelines to the use of these
properties somewhere?

I was also wondering if anyone on this list could say why the Google
Structured Data Testing Tool throws errors on suitableForDiet, e.g.,

  "http://schema.org/VeganDiet (The property suitableForDiet is not
recognized by Google for an object of type Recipe.)"

Thanks, just joined the list, hope these questions are appropriate here.

Eric