How Long Before Breast Lift and Tummy Tuck Stitches Dissolve?

It’s not unusual for plastic surgeons to use long lasting
absorbable sutures when performing breast lift and tummy tuck surgery. These sutures are used in an effort to avoid
spread of the scar. They provide support
to the wound closure, until the wound has gained adequate strength.A large
variety of absorbable sutures are currently unbailable for wound closed.These sutures each have unique absorption
characteristic.It’s not unusual for
some of these sutures to last for six to nine months following surgery.In most
cases, this doesn’t represent a problem, occasionally absorbable sutures
protrude through the skin following surgery.With appropriate care this should represent a minor problem with no long
term consequences.

As stated below sutures for the tummy tuck differ from the mastopexy.
Some sutures/staples are permanent but generally removed by 3 weeks at most with the exception of the muscle tightening stitch which may be left in place forever.
Absorbable sutures vary in the amount of time they lose strength and are subsequently absorbed which is usually twice as long as losing strength. Some are absorbed by 3 weeks whereas others can easily persist for up to and beyond 6 months. Generally by 9 months, 100 percent of most sutures are absorbed.

Thanks for your question -
As several of the other doctors have mentioned - it depends on the type of material. Your muscle plication may have been performed with sutures that don't dissolve or dissolve very slowly while sutures used in a subdermal or subcuticular closure may dissolve in one to two months.
Ask your surgeon what they used and they should be able to give you an accurate time frame.
I hope this helps.