...
{
  "@type": "OpeningHoursSpecification",
  "opens": "T00:00:00",
  "closes": "T23:59:59",
  "deliveryHours": {
    "@type": "AdvanceServiceDeliveryHoursSpecification",
    "opens": "T10:00:00", // Delivery starts at 10:00AM
    "closes": "T15:00:00", // Delivery ends at 3:00PM. Delivery from 10AM-2:59:59PM.
    "dayOfWeek": [
      "Monday",
      "Tuesday",
      "Wednesday",
      "Thursday",
      "Friday"
    ],
    "serviceTimeInterval": "PT15M", // in slots spaced 15 minutes apart
    "advanceBookingRequirement": {
      "minValue": 60,   // The slot should be at least 60 mins away
      "maxValue": 8640, // but not more than 6 days away
      "unitCode": "MIN"
    }
  }
}
...