How long a woman mast?

It seems like there might be a typo in your question. If you're asking about how long a woman can breastfeed, it varies widely depending on personal choice, cultural practices, and health considerations. The World Health Organization recommends exclusive breastfeeding for the first six months, followed by continued breastfeeding along with appropriate complementary foods for up to two years or beyond. If you meant something else, please clarify!