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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.