Abstract: A long-life substance dispensing device for a washing machine, particularly a dishwasher, comprises: —a body (20?, 30?) designed to be sealingly fixed to a structure of the washing machine, —a support means (40) adapted to contain a total amount of a substance sufficient for performing a plurality of washing cycles, —an actuation system (47?, 50?, 61?) which is electrically controllable for causing delivery of at least one dose of the substance contained in the support means (40). The actuation system (47?, 50?, 61?) comprises at least one drive element and one driven element (47?) capable of cooperating to obtain the delivery. The actuation system (47?, 50?, 61?) is arranged for being able to take on an operative condition, wherein the drive element (61?) is operatively coupled with the driven element (47?), and an inoperative condition, wherein the drive element (61?) is decoupled from the driven element (47?).