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Google updated the Recipe rich result documentation by removing the section on 'Guided Recipes', which was a Google Assistant feature that has now been deprecated. Previously, recipeIngredient and recipeInstructions were required properties for Guided Recipes but only recommended properties for Google Search, so the documentation now also reflects that these are just recommended properties.
Google updated their documentation for the Recipe search feature, changing the descriptions for three recommended properties: cookTime, prepTime and totalTime.
In the descriptions for these properties, this sentence has been removed: 'You can use min and max as child elements to specify a range of time.'
Currently, the only supported method is an exact time; time ranges aren't supported. If you're currently specifying a time range and you'd like Google to better understand your time values, they recommend updating that value in your structured data to a single value (for example, "cookTime": "PT30M").
Guided Recipes are now supported in Search Console and in the Rich Results Test tool, which allows you to test and validate markup, and be alerted of validation errors.