treecombobox AutoCompleteDelay property
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Applies to
acTreeComboBox component.  

property AutoCompleteDelay: Integer; // 100 milliseconds by default  

The AutoCompleteDelay property speicifes the delay, in milliseconds, which should pass between keypress and attempt to auto-complete the input.  
By default AutoCompleteDelay = 100 milliseconds, that means that when user typed the character and delayed 1/10 of second before typing the next character, the combo box will try to auto-complete the input searching the item with the text which begins with the currently typed string.  

See also
AutoComplete, AutoCompleteIgnoreCase, Items, ShowEditor and SelectedNode properties.