Most full time master’s degrees in the USA take one to two years to complete. That is the standard range. Some programs run longer, up to three years, and some are built to finish in a single year.
What sets the length is the program’s design. The number of required credits, whether there is a thesis or capstone project, and the field of study all matter. Professional programs with internships or clinical hours usually take longer. Accelerated programs pack the same credits into a shorter calendar with heavier weekly workloads.
Part time and online programs give more flexibility but take longer in calendar time, since you complete fewer credits per term. If you need to work while studying, a part time pace may suit you better even though the degree takes more years to finish.
When you compare programs, ask for the total credits and the typical completion time for full time students. Related reading: whether a 1 year master’s is accepted in the USA, how much a master’s degree costs in the USA, whether online master’s degrees are credible, and whether you can do a PhD without a master’s.

