[wly_cdgr]

Don't know the current answers to all your questions, but re: courseload: you can take 6 credits max in the fall and spring and 3 credits max in the summer. You need 30+ credits to graduate, so the quickest you can finish is 2 years (but this should be quite doable from a workload POV if you're not working full-time)

[ailun]

I don't know for sure about OMSCS, but in OMSA you can ask the advisors to let you take more than 6 credits and they'll usually approve it. There are a fair amount of people who try to finish it in 3 semesters, although that seems a little crazy to me. It probably depends on your course selection, but I would struggle to take more than 3 classes (9 credits) at once (without working), and I would definitely have a shallower understanding of the material.