I'm having a left femur biopsy Curettage Grafting and Internal Fixation...how long will it take to heal?(55yo)?

I have had stage IV, or terminal cancer for about 4 years. Soft Tissue Sarcoma, or Malignant Fibrous Histiocytoma of the left glute. (left buttock). I had a re-section, radiation and chemo for two years. Now I have left leg pain and the MRI showed a tumor thinning the bone...so this is the doctor's solution. He is an orthopedic oncologist. I don't know if this means it has metastasized or what.