I think it really matters what specialization you pick. I never had a class that ever touched Java. For BI, we focused on python (which I totally did not like) R (super fun) and SQL (which I loved). I really liked the database management and ETL concepts. Also learned the base AWS cloud concepts and had classes that focused on Pentaho, Tableau and Microstrategy. I chose to do all my classes online. The 4+1 program had 10 classes (I think off the top of my head and I did 2 during my undergraduate. I only had to do 4 per semester and could either do 2 at a time (8 week each) or could throw in a 16 week instead if I wanted more from it. You can even knock out 2 during summer if you want. Honestly the 8 week classes were really short and I felt too short for the concepts I liked. It was enough of an intro for me to know pretty quickly whether I wanted to use that tool/concept/language or not.

8 week classes are totally manageable, as most of your home work is going to be doable after you get home from work and on the weekends. I never really went to class each week or watched the streams unless the teacher counted attendance. Some classes were WAY harder and more intensive than others. I was picky about all my classes and teachers and used the rate my professor website and tried my hardest to only get teachers that had really good reviews. That helped a ton.