...
{
  "@type": "OpeningHoursSpecification",
  "opens": "T08:00:00",  // Ordering opens at 8:00AM
  "closes": "T17:00:00",  // Ordering closes at 5:00PM, last order at 4:59:59PM
  "deliveryHours": [
    // [START ServiceDeliveryHoursSpecification]
    {
      "@type": "ServiceDeliveryHoursSpecification",
      "opens": "T08:00:00",
      "closes": "T17:00:00",
      "deliveryLeadTime": {
        "@type": "QuantitativeValue",
        "value": "60", // If no exact deliveryLeadTime, put a maximum time
        "unitCode": "MIN"
      }
    },
    // [END ServiceDeliveryHoursSpecification]
    {
      "@type": "AdvanceServiceDeliveryHoursSpecification",
      "opens": "T08:00:00",
      "closes": "T17:00:00",
      "serviceTimeInterval": "PT15M", // in slots spaced 15 minutes apart
      "advanceBookingRequirement": {
        "minValue": 90,   // The slot should be at least 90 mins away
        "maxValue": 8640, // but not more than 6 days away
        "unitCode": "MIN"
      }
    }
  ]
}
...