When I was a graduate students at UC Berkeley in the School of information I took 40.5 units in one semester. They mostly were graduate engineering, business and iSchool classes, 42 units was needed to graduate. That semester I taught engineering and ran a company. The secret was I integrated everything and stayed away from programming classes. Most times I just took about 35 units. The secret is you must really enjoy what you were doing. At UC Davis I took 10 classes in a quarter for my MBA (4 is usual) but you paid the same so I got my MBA in one-year.
What is this? Bragging? ^:)^