Maybe its just me or my riding style (poor sense of balance...whatever) but I've found that searching for and marking the splits always screws up that particular ride for the total distance. I stopped doing splits years ago on the certification rides and of course end up riding at least a third time for the splits which I later document with digital pics and descriptions.
But then for me it doesn't really matter as I only measure local races and have never travelled farther than 60 km to do a measurement so the time factor isn't an issue.