The speed at which alterations are completed can vary depending on several factors, including the complexity of the alteration, the availability of the tailor or seamstress, and the current workload of the alteration service provider. Generally, simple alterations can be completed within a few days, while more intricate or time-consuming alterations may take longer. Here are some general guidelines:

1. Basic alterations: Simple alterations like hemming pants or skirts, taking in or letting out seams, or shortening sleeves can often be completed within a few days to a week, depending on the workload of the tailor or seamstress.

2. Complex alterations: Alterations that involve major adjustments or modifications, such as resizing a garment, altering the structure or silhouette, or working 24 Hours Alterations Services with delicate fabrics, may require more time. These alterations can take anywhere from a week to several weeks, depending on the specific requirements and the availability of the professional.

3. Bridal or formal wear alterations: Alterations for wedding dresses, formal gowns, or other special occasion garments often require meticulous work and may involve multiple fittings. It's recommended to plan these alterations well in advance, typically allowing for several weeks to a few months, depending on the complexity of the alterations and the alterations specialist's schedule.

It's important to note that these timeframes are general estimates and can vary. To get a more accurate timeline for your specific alteration needs, it's best to consult with a professional tailor or alteration service. They can assess your requirements, provide an estimated timeline, and inform you of any potential delays based on their current workload.