How Long Will It Take for 1/2 Centimeter Wound Dehiscence to Heal?

Hard to tell much without a photo or exam.  The opening can be caused by a few things. Usually it is tension on the wound. Sometimes a suture placed in the wound under the skin will spit out. This may cause the wound to then open a little. Now that the foreign body is out, the wound should heal.  It will take time, (weeks to months), depending on the extent of the wound opening.   Please follow  your board certified plastic surgeon's instructions.

The problem you are experiencing does occur after breast augmentation surgery. As you mentioned, this problem is often related to a suture that  makes its way to the surface. Once this offending “foreign body” is removed,  the openings tend to heal quickly (over the course of one to 2 weeks at most).

 Continued close follow-up with your plastic surgeon.

Best wishes.

First, follow whatever your surgeon says if you trust them. Second, I would say that you limit the overall strenuous activity for 6 weeks total. I do not know what is going on but if you truly have that much of a dehiscence I would maybe numb it up in the office and close it, but I am not there to see it so it is so hard to say. It commonly will take a few weeks for that to heal on it's own with meticulous cleaning and good wound care.