Sets the time in seconds before any journal files are flushed to disk. A reasonable value for this variable is 30 seconds. To disable journalling, set this variable to 0 or false.
By default Emacs will not journal scratch buffers, even when current-buffer-journalled is 1. This is normally a good thing as its improves the performance of Emacs. Many packages use scratch buffers which would be journalled if this variable was set to 1.
Set this variable to 1 will enable journalling on all buffers.