When you get a BBL how long do you have to stay completely off your butt?

Best to ask your plastic surgeon for his/her recommendation.  I recommend that my patients minimize sitting, even with a pillow (boppy or BBL), for the first two weeks.  If they must sit, every 30 minutes or an hour, they should get up and stand for a few seconds to take the pressure off.   This reduces the chance for fat necrosis. I usually recommend about 6 weeks before sitting without a pillow. After 6 weeks the fat has revascularized, and they will have a very good idea of their final results.  
Kenneth Hughes, MD, Board Certified Plastic Surgeon
Los Angeles, CA

Thank you very much for this interesting question. The recovery time after a BBL is three months, after that you can start again normal activities. Kind regards,Dr. Emmanuel Mallol Cotes.-