Thank you for your question . 4 days is not recommended i ask for my patients to have a minimum of 6 days. Please use a boppy pillow in order to help you having to put less pressure in your buttocks while sitting sown. Choose a board certified plastic surgeon who has done a ton of Brazilian Butt Lifts and has privileges to do this surgery at a local university hospital. This says his credentials have been checked out by fellow Drs. All surgeries carry risk, talk to your plastic surgeon and choose one wisely.
I think that it is a good idea to stay in town by your operating surgeon for a week or so. Traveling too soon is not recommended. Best to ask your doctor his thoughts.