How long i'd have to use the bainder in my breast so i don't get infection, mastitis, hard and swollen breast after a c-section, i can't breastfeed.

Cold packs, too: In addition to the binder, wear a tight bra and put cold packs on your breast asap after delivery to reduce blood flow to your breasts. Can i ask you to rethink breastfeeding? It's great for you and baby, even if it is only for one day - there are even benefits with that. But if not, cold, binder, avoid hot showers and stimulation.

Only a few days: You don't have to use it and you are still likely to get engorged, but the binder will be somewhat helpful. Your breasts will be most uncomfortable for about a day. So long as you don't try to empty them, they will then start to go back to normal and the binder will no longer be necessary.