What is the most college units completed in a single year?

There's no official record or limit on the most college units completed in a single year. The number depends entirely on:

* The institution's policies: Some colleges have maximum credit hour limits per semester or year.

* The student's course load: A highly motivated and capable student could potentially take a very heavy course load. This might involve summer courses and other intensive study options.

* The definition of a "unit": Credit hour systems vary slightly between institutions.

While some students might take an exceptionally large number of units, there's no universally recognized "most" because it's highly variable and not tracked centrally.