+@code{nil}. The value of @code{suggest-key-bindings} can also be a
+number, in which case Emacs will show the binding for that many
+seconds before removing it from display. The default behavior is to
+display the binding for 2 seconds.
+
+ Commands that don't have key bindings, can still be invoked after
+typing less than their full name at the @samp{M-x} prompt. Emacs
+mentions such shorthands in the echo area if they are significantly
+shorter than the full command name. The setting of
+@code{suggest-key-bindings} affects these hints as well.