* Most commonly: A bachelor's degree is required. This is typically a four-year program, but some may take longer.
* Some programs may accept: Students with equivalent experience or other degrees (e.g., an associate's degree plus significant work experience). However, this is less common and the specific requirements vary considerably by program.
Therefore, while a four-year bachelor's degree is the most common prerequisite, the "years of graduation" required is best answered by looking at the specific admission requirements of the master's program you're interested in.