How many days will speed post take to reach from Delhi to Mumbai?

"Results": [
    {
        "TypeName": "LOC",
        "Text": "Delhi",
        "Start": 49,
        "End": 54
    },
    {
        "TypeName": "LOC",
        "Text": "Mumbai",
        "Start": 58,
        "End": 64
    }
]