Because the milk is always ready, usually nursing a baby takes less overall time than formula feeding. Formula requires measuring, mixing, sterilizing and cleanup. When you travel with a formula fed baby, you need extra time to pack the artificial baby milk, bottles, nipples, rubber rings, etc. Access to pure water may be unsure and sterilizing equipment may not be available. There are two situations when it may take a bit more time to breastfeed.
Nursing is something that a mother and baby learn together.
Like anything we need to learn, in the beginning, it takes longer. Many women in our culture have never seen a baby nurse. The mother may not know how to put the baby to the breast and may have questions. To prepare for nursing, the mother should educate herself about breastfeeding before the baby is born and know where to get help quickly after birth. After the mother and baby learn how to nurse, breastfeeding is much more convenient.