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The problem has more to do with the really long x axis labels than the responsiveness. That said, setting maintainAspectRatio will solve your problem.
Chart.defaults.global.maintainAspectRatio = false;
Note that you can do this per chart too.
If you want to maintain the aspect ratio too, you can extend the chart to trim the labels like in https://stackoverflow.com/a/31699438/360067
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Source:stackexchange.com