This is a case-by-case basis. Routinely I would wait a few weeks, but there are many mitigating factors. This includes the status of your recovery, the blood flow post BBL, as well as your own personal factors that make you and your BBL unique.
My recommendation would be to research an ASPS surgeon who specializes in the Brazilian butt lift. Schedule a consult with his office. An in-person visit with an accredited surgeon is the best way to get specific information.
Best of luck, please let us know how it goes.
Dr. Constantino Mendieta