Between a week and two months, depending on the alterations needed. Simple changes, like hem adjustments, can often be done within a few business days, while more complicated jobs (like neckline modifications or adding sleeves and beaded/embroidered embellishments) can take much longer. The speed at which a seamstress or tailor can complete a job for you may also depend upon how many other jobs they currently have on their plate. Note that Terry Costa does not offer alterations services in house. Because we have such a large inventory selection, it leaves no room for any tailoring services. We do, however, have a list of recommended trusted, local tailors that we have referred people to for years.