Is it safe to have mini facelift & tummy tuck together?

In general this combination should be safe if you are in good health, and the surgery can be completed in about 5 hours.  Procedures of longer duration have some increase in complication rate according to some data.  With abdominoplasty in particular there is a higher risk of venous thrombosis than other procedures, so it is important that any risk factors be carefully considered, and appropriate prophylactic measures taken.

Combining cosmetic plastic surgery procedures is not
uncommon. Whether you are a reasonable candidate for those procedures depends
on your anatomy, your medical history, extent of the procedures, realistic expectations of the outcome
and an understanding of the pros and cons of the various procedures.
Safety should always be the main concern. It is generally recommended that the
length of elective surgery be less than six hours. The procedures should be
performed in an ambulatory facility that is accredited by one of the
national organizations like the American Association for Accreditation of
Ambulatory Surgical Facilities (AAAASF) or in a licensed hospital. Many
surgeons would recommend an overnight stay at an appropriate facility where you
can be appropriately monitored. Most patients prefer undergoing one anesthesia
and one recovery period which is usually more cost effective.
Keep in mind that following the advice of any surgeon on this or any other web
site who proposes to tell you what to do without: examining you, physically
feeling the tissue, assessing your desired outcome, and taking a full medical
history, as well as discussing the pros and cons of each operative option would
not be in your best interest. I would suggest you find a Board Certified
Plastic Surgeon certified by The American Board of
Plastic Surgery who is ideally a member of the American Society for Aesthetic
Plastic Surgery (ASAPS) that you trust and are comfortable with, and discuss
your concerns with that surgeon in person. That way, you can have a better idea
what is safe and makes the most sense for you.
Before proceeding with a combination of these procedures, you should have
medical clearance from your primary care physician and a discussion between him
or her and your plastic surgeon.
Robert Singer, MD FACS
La Jolla, California

Generally speaking, combination surgical procedures are done routinely. However, you are wise in being concerned about the safety of combination surgery; risks/possible complications do increase with increased length of surgery…  
It is best to evaluate each patient's suitability for combination surgery on an individualized basis. During this consultation process, after a complete history and physical, the SAFETY of combining these surgical procedures becomes of paramount importance. Plastic surgeon, anesthesia provider, duration of surgery, surgery facility all important considerations. Your best bet: choose your plastic surgeon very carefully; everything else including good judgment/advice/planning, anesthesia provider and safe surgery facility will follow. Best wishes.