Recovery time for explant (under the muscle)?

Thank you for the question.  
 Breast implant removal recovery surgery is usually almost painless and associated with a faster return to activities compared to the original breast augmentation procedure.  The procedure can be done under local or general anesthesia depending on the circumstances of the specific patient.  Your plastic surgeon will be your best resource when it comes to more specific thoughts, mainly depending on exactly what procedure is performed.
 
Generally speaking what breasts look like after explantation depends on several factors such as: the quality of skin elasticity (the better the elasticity the better the skin will bounce back), the size of the implants used (the larger the implant the more trouble you may have with redundant skin), and the amount of breast tissue present at this time (which may have changed since the time of your breast augmentation).
Life experience since your breast augmentation procedure, such as pregnancy or weight gain weight loss, will potentially influence the factors discussed above. If you take these factors into consideration and apply them to your specific circumstances you may get a good idea of what to expect after the implants are removed. I would suggest that you select your plastic surgeon carefully; it is likely, that working together you will come up with the best plan of action. You may find the attached link, dedicated to breast implant removal surgery concerns, helpful to you as you learn more.
Best wishes for an outcome that you will be pleased with long-term.

If only explantation is performed without lift or capsule alteration, the recovery should be speedy and relatively painless as you will only have an incision without any pocket dissection.  One week off work may be sufficient.  There will always be a small risk of hematoma, fluid collection, or infection, but this is a much easier recovery than placing implants.Kenneth Hughes, MD, ABPS Board Certified Plastic SurgeonLos Angeles, CA

Patients that are having implants removed usually recover very quickly.  After removal, incisions will have a few stitches and bandages over them.  As with any surgery, exercise should be avoided for 3 weeks and patients can return to work when they are not in need of pain medication.  Good luck.