<p>Anecdote is not evidence, of course, but my d. with lowish academish stats that ranked in her in the bottom 15% of her entering class (and not at a “most selective” institution either) finished in six, and had her masters degree after four year (while working the last year close to full time). </p>
<p>This will also vary by institution in terms of how difficult they make this - it is likely more difficult at large state unis these days.</p>