var blinds = [
            {
                "round": 1,
                "duration":20,
                "break":0
            },
            {
                "round": 2,
                "duration":20,
                "break":0
            },
            {
                "round": 3,
                "duration":20,
                "break":0
            },
            {
                "round": 4,
                "duration":20,
                "break":20 //break here
            },
            {
                "round": 5,
                "duration":20,
                "break":0
            },
            {
                "round": 6,
                "duration":20,
                "break":0
            },
            {
                "round": 7,
                "duration":20,
                "break":20 //other break
            }
        ];

        blinds.map(function (item) {
            item.duration = item.duration * 60; //convert to seconds
            return item;
        }).filter(function (item) {
            return item.round >= 2
        }).reduce(function (ac, item) {
            console.log(item)
            return ac;
        }, 0)