That depends on the type of movement in the watch and how much power is left in the mainspring when you take it off.
A normal, fully wound automatic movement will keep running from 36 to 48 hours. Frederic Piguet, the Swiss movement manufacturer which specializes in complicated movements, produces an automatic movement which stores 100 hours of power
. Bernhard Stoeber, vice president of technical services at the Movado Group, recommends winding an automatic watch when one takes it off so that it will keep running as long as possible when not worn
. Stoeber also suggests occasionally winding an automatic that is not worn for an extended period of time in order to keep the oils properly lubricated and distributed - (
replica movado watches). - (
Vacheron Constantin SWISS)