confy raspored vlez

{
    "conference_name": "bla bla",
    "num_days": 3,
    "start_time": ["08:00", "09:00", "08:00"],
    "end_time": ["20:00", "20:00", "20:00"],
    "num_sessions":  // dali sekoj den ist broj sesii?
    "sessions": ["bla bla", ""]
    "len_presentations": 20,
    "presentations": [
        {
            "title": "ADad",
            "author": "IMe Prezime",
            "topic": "asddasd"
        },
        {
            "title": "ADad",
            "author": "IMe Prezime",
            "topic": "asddasd"
        },
        {
            "title": "ADad",
            "author": "IMe Prezime",
            "topic": "asddasd"
        }
    ]
}

// kako da se definirat pauzite?