To improve the accuracy of a mechanical watch, it is recommended that you wind up the mainspring every day, at a fixed time, even if the watch is a self-winding type.
Wind up your watch before you wear it
It is important that sufficient energy is supplied to each movement by the mainspring of the watch. The accuracy of a mechanical watch will be more stable if it is wound up sufficiently. If the spring unwinds causing the energy level to drop, the parts controlling accuracy become easily affected
by environmental factors.
Wind the mainspring up fully to stabilize accuracy
If the watch is used without being fully wound up, a gain or loss of time may result. To avoid this, it is recommended that you wear the watch daily for more than 8 hours.