When having a mastectomy single or double. How long ate you on hosp? Complications likely to arise from copd?

Speak to your doctor. This question can only be answered by your surgeon and anesthesiologist. If you find that your questions are not being answered, then get a second opinion. You should be made to feel comfortable by your clinician when asking questions. It is your right to the information as a patient.
Short hospital stay. The hospital length of stay following a mastectomy is usually 1-2 days without reconstruction, and 2-3 with reconstruction. It's hard to predict the probability of complications related to copd, since that can vary from mild to severe. I recommend that you pose that question to your specific lung specialist and surgeon. Good luck.