SMART datagrid v.1 > Classes > DisplayOptions
It specifies the waiting time just before displaying the tooltip in milliseconds. 
It is used to control to display the tooltip too many times in a short period of time. You can set the period of displaying the tooltip by tooltipDuration.
Defaults to 400 ms.
    grid.setOptions({
        display: {
            tooltipDelay: 0,
            tooltipDuration: 5000
        }
    });
    grid.setDisplayOptions({
        // Display the tooltip immediately without delay.
        tooltipDelay: 0,
        tooltipDuration: 5000
    });
    grid.displayOptions().setTooltipDelay(0);