Assuming you don't need timecode for any other purposes such as syncing audio or multiple cameras, you can use this feature to show you the clip duration as you record.
To do this, go the Menu > MOVIE SETTING (screen 4/5) > Time Code Setting,
turn on TIME CODE DISPLAY,
reset START TIME SETTING to 00:00:00:00
set the COUNT UP SETTING to REC RUN
Hope this helps,