Generally, breastfeeding your baby needs to be done every 2-3 hours. Therefore, if you use a breast pump to suck milk, you should also suck milk every 2-3 hours for about 15-20 minutes. If you feel that there is no milk in your breasts for 2-3 hours, you can adjust the time yourself. However, you should pay attention not to let the milk accumulate in your breasts as much as possible. The extra milk can be put in the refrigerator in a breast milk preservation bag, and it is not recommended to keep it at room temperature to avoid deterioration.