<p>Cousin’s husband got a PhD in one year. He was already an expert in his field and the degree was just a formality. </p>
<p>Brother did his PhD in 6 years, night school, NYU. He was working in his field and had access to information he needed. </p>
<p>Sister’s husband did his PhD in 2 years. Already an expert in his field and had been thinking about his theory for a few years previously.</p>
<p>Son just completed his MS dissertation after 3 terms and 2 months. He got another 3 months before his contract runs out. </p>
<p>Kinda depends on the field of study (these are technical endeavors), resources, and expertise.</p>