When will extreme swelling (from BBL) in buttocks go down so I feel comfortable leaving the house?

As your surgeon probably pointed out, more fat is injected than is needed because no matter how carefully and technically advanced the fat is transferred from one place to another, a certain percentage will not survive over the long term. Also, in the short term (as you've noticed) there is swelling simply from the injection of the fat. The swelling is mostly visibly resolved in about 4-6 weeks (although you correctly noted it may take longer for all of it to go away) leaving a reasonably good estimation of the early fat 'take'. The total volume may go down over the next few months then settle in the final volume. Please don't do anything at this early juncture to encourage fat destruction since you have time for everything to settle down and good luck.

Thanks for your question. Recovery from liposuction and Brazilian butt lift is usually 1-2 weeks. Patients may experience bruising and tenderness in the areas where liposuction was performed, with very little pain on the actual buttocks.

Hello dear!!
Thanks for the question and provided information as well.
You are still early on the healing process, it can take up to six months to see your final results, so please be patient​. After a BBL, only about 70% of the transferred fat cells will survive, so you can expect a reduction in your buttocks. If you have any concerns, I suggest you follow up close with your plastic surgeon.
Good luck :)