The best time to replace a ruptured saline implant is immediately after the deflation is noticed. The reason for this is that the capsule, or scar layer surrounding the implant will begin to shrink down around the deflated implants.
After a certain time passes (approximately 2-4 weeks), replacing the implant may require opening of the shrunken capsule to accommodate the volume of the new implant. In your case, the deflation happened "some time ago." If this time is longer than about 4 weeks, you would likely require capsulotomy for proper positioning of the new implant.
Aside from this, there is no inherent danger in waiting to have your implant removed and replaced, other than cosmesis.




