I don't know about making you any better, but I would say that it is an 'attention to detail' item. I would want my resume to reflect, as accurately as possible, my experience to the tee - especially as FlyerJosh pointed out - you are on the low end of the time scale.

It seems there were stories on this forum recently about people not getting calls because they were a single hour short. It certainly doesn't cost you any pain I would think to regularly update your logbook, especially when job hunting.

USMCFLYR