You should look at the documentation of chartjs and specifically linear axis: chartjs documentation

Code Example:

JsFiddle Example

xAxes: [{
type: 'time',
ticks: {
    autoSkip: true,
    maxTicksLimit: 20
}
}]

Your question is not elaborate enough. Atleast you should have given sample json for the chartjs via which you are plotting. From my understanding this should work :

xAxis: {
          ticks: {
                maxTicksLimit: 10
            }
        }