When considering multiple cosmetic procedures, the process involves careful planning to ensure safety and optimal results. It's common to combine surgeries, but there are typically limits on the duration of each operation to ensure patient safety. The general guideline is that elective surgeries should not exceed six hours, though this can vary depending on your surgeon's approach and experience and your individual risk profile. Twelve hours is too long for an elective outpatient aesthetic surgical procedure (and these procedures should easily take less than 6 hours). For the procedures you’re considering, it’s likely that some can be done together in one session, while others might require staging. Ultimately, the most effective plan will depend on your specific goals, health status, and recovery time. It’s crucial to consult with an experienced plastic surgeon who can assess your case, determine the safest way to combine the procedures, and create a personalized plan based on your priorities and desired results. Krishna Vyas, MD, PhD, MHSHarvard, Hopkins, & Mayo Clinic Trained Aesthetic Plastic SurgeonNew York, New York