markerDefaults.tooltip.showAfter Number(default: 100)

Specify the delay in milliseconds before the tooltip is shown. This option is ignored if showOn is set to "click" or "focus".

Example - set show delay

<div id="map"></div>
<script>
    $("#map").kendoMap({
        layers: [{
            type: "tile",
            urlTemplate: "http://a.tile.openstreetmap.org/#= zoom #/#= x #/#= y #.png",
            attribution: "&copy; OpenStreetMap"
        }],
        markerDefaults: {
            tooltip: {
                showOn: "mouseenter",
                showAfter: 1000,
                content: "Foo"
            }
        },
        markers: [{
            location: [42, 27]
        }, {
            location: [40, 20]
        }]
    });
</script>