// Root myDeserializedClass = JsonConvert.DeserializeObject<Root>(myJsonResponse);
    public class OpenClose
    {
        public string startTimeOfDay { get; set; }
        public string endTimeOfDay { get; set; }
    }

    public class Root
    {
        public TimeWindowDetails timeWindowDetails { get; set; }
    }

    public class TimeWindowDetails
    {
        public List<OpenClose> openCloses { get; set; }
    }