score:4

Accepted answer

Assuming that you want to get from the first serie.

console.log(chart.series[0].data.length);

Demo

score:2

Using jQuery and assuming you've defined the chart as a variable named chart ...

$.each(
    chart.series,
    function(){
        console.log(this.name + ": " + this.data.length + " data points.");
    }
);

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