Breast milk is the nutrient and immune fluid produced in a woman's body after childbirth. For most healthy lactating mothers, milk production is natural and will be regulated according to the baby's needs. So, how many hours does milk develop? First of all, it is important to understand that milk production is affected by hormones. When the baby sucks on the mother's nipple, this stimulation triggers the secretion of prolactin and oxytocin in the mother's body. The main role of prolactin is to promote the production of milk by the mammary glands, while oxytocin helps in the secretion and release of milk. 
The speed and frequency of milk production depends on many factors, including the mother's nutritional status, water intake, rest, and how often the baby sucks. In general, milk production is faster when the baby sucks frequently, and it adjusts to the baby's needs. Specifically, if the interaction between mother and baby is normal and the mother has adequate nutrient and fluid intake, milk production usually begins within a few hours of the baby suckling. Within the first few weeks, many mothers will find that their breasts will start to produce a type of colostrum, which is a very nutritious milk that has great benefits for the baby's immune system and growth. Over time, milk production gradually increases until it reaches a stable level. At this stage, mothers often find that they need to feed their babies regularly to meet the baby's needs. In general, feeding every two to three hours is common practice, but this will also be adjusted according to the needs of each baby and the feelings of the mother. 
It is important to note that if the mother feels that the breasts do not have enough time to produce milk, or if the baby always seems to be crying or acting hungry, then this may be a sign of insufficient milk production. In such cases, it is advisable for the mother to consult a doctor or a professional lactation consultant for help and advice. 
In conclusion, milk production is a natural physiological process that regulates according to the needs of the baby. Most healthy breastfeeding mothers can produce enough milk to meet their baby's needs under the stimulation of their baby's suckling. However, if you encounter any questions or concerns, it is best to consult a doctor or lactation consultant for professional advice and support.