How long will this take to heal? My incision split open & drainage came out once drains removed.I know it will take time.(photo)

I agree that you may want to see your surgeon and possibly revise your plan of action. From your photo, the tissue does appear healthy and not infected. If you have a larger cavity beneath the opening, it will take longer to heal. Also, wound healing is not a steady process. It takes a couple of weeks for the body to rev up the healing factory to make the proteins that heal the wounds, but once that occurs, the wounds close faster. If you have a larger cavity beneath the skin, your surgeon may suggest that you use moistened gauze to keep the wound from drying out.

It is very important to visit your surgeon again and see if something can be changed in the wound care process. If you do not get a satisfying answer then you ask for a second opinion with anotherdoctor as werll. Best of luck    

If this indeed hasn't progressed over recent weeks, another visit to your surgeon is in order to review your progress and revise the care plan.  I can't really tell from the photo how large this is on the surface, and how big the underlying hole is.  Usually these heal with local wound care, but without requiring surgeryAll the best.