Generally, the removal and replacement will take place during one surgery. However, in some instances, patients may need two separate surgery. If an infection is one of the reasons you want to remove your implants then you will need to wait a month or two before replacement surgery. Some patients even use this time to see how they would feel with a smaller bust.
Also, If your breasts have begun to sag slightly or the nipples are pointing down, considering a breast implant removal and lift is a better option.