Variable: minibuffer-message-timeout
minibuffer-message-timeout is a variable defined in keyboard.c.
Value
2
Documentation
How long to display an echo-area message when the minibuffer is active.
If the value is a number, it should be specified in seconds. If the value is not a number, such messages never time out.
Source Code
// Defined in /usr/src/emacs/src/keyboard.c
DEFVAR_LISP ("minibuffer-message-timeout", Vminibuffer_message_timeout,
doc: /* How long to display an echo-area message when the minibuffer is active.
If the value is a number, it should be specified in seconds.
If the value is not a number, such messages never time out. */);