Omega says that this allows the LdP to take more accurate measurements during
link the 15 days of chronometer
link testing according to the ISO 3159 standard. This standard outlines the positions temperatures and conditions a watch must undergo to meet chronometer standards according to
link ISO. The 15-day testing period is specifically for wristwatches if you care carriage clocks get measured over 19 days and quartz watches over 13 days.