The value you’re looking at, is seconds from epoch. It is not a duration, but actually a date. In JavaScript, you may convert this value to milliseconds from epoch, and construct a date object out of it.
See the following snippet:
var secondsFromEpoch = 1518292800;
var millisFromEpoch = secondsFromEpoch * 1000;
var date = new Date(millisFromEpoch);
console.log(date.toLocaleString());
So, this value represents the date Feb 11, 2018, and time 1:30am.
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