https://www.telerik.com/kendo-jquery-ui/documentation/api/javascript/dataviz/ui/stock-chart/configuration/navigator.categoryaxis.baseunitstep
navigator.categoryAxis.baseUnitStep - API Reference - Kendo UI StockChart - Kendo UI for jQuery
In this article you can see how to configure the navigator.categoryAxis.baseUnitStep property of the Kendo UI StockChart.
api referencekendo uinavigatorcategoryaxisstockchart