IMHO...The chronometer is a "cutesy" little feature that MTH added to DCS...because they could...never realizing folks would take the information so seriously.
If it really, really mattered...there would be chronometers on a whole lot of other electronic equipment.
Does a PC, a laptop, TV, or a cell phone have a chronometer one can check...to see how "used" the electronics might be? Not that I am aware of...but, maybe they do.