* Program type: Full-time programs typically take 3-5 years to complete, while part-time programs can extend to 6-8 years or even longer.
* Prior education: Students with a master's degree in a related field will generally complete the program faster than those entering with a bachelor's degree. Some programs may even require a master's degree for admission.
* Research requirements: The scope and complexity of the dissertation research significantly impact the timeline. A more extensive research project will naturally take longer.
* Course load: The number of courses taken per semester or term also affects the overall duration.
Therefore, there's no single answer. A reasonable estimate would be 3-6 years for a full-time program and 6-8 years or more for a part-time program. It's best to consult the specific program's website or contact the admissions office for accurate information about program length.