The duration of spousal or adult breastfeeding depends entirely on personal relationship agreements, hormonal stimulation, and milk supply maintenance, as lactation continues only with consistent physical expression or nursing. Biologically, milk production requires the ongoing presence of prolactin and oxytocin stimulated by regular nursing or breast pumping. If milk expression stops, supply naturally dries up within days or weeks. Because adult breastfeeding is a niche interpersonal preference rather than a medical norm, there are no standard biological timelines, and the duration is determined solely by the mutual comfort, consent, and shared desires of the partners involved in the relationship.
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