It is essential that you not sit directly on your buttocks for up to three weeks, ideally, to allow for the best possible 'take' of the fat graft in your buttocks. If you place pressure on the area too soon, you may lose some of the fat graft.Since you sit at work, I'd recommend taking three weeks off if you can swing it.Best wishes!
For my patients, I generally recommend a week off from work if you can afford it. This would be longer if the job is physically demanding. When you do return, you will have to use a pillow until the three week mark, to avoid direct pressure on the healing graft.Best of luck!Dr. SubbioBoard-Certified Plastic SurgeonNewtown Square/Philadelphia, PA