To do this, you need to set the ShowCellToolTips property of your DataGridView to false , but rather use a standard tooltip element controlled by the CellMouseEnter DataGridView event. You can then set the AutoPopDelay property to the number of milliseconds that you want to display for the tooltip window.
More information and sample VB.Net code for using the standard ToolTip control using the DataGridView can be found here .
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