Yes, I worked full-time. I'm fortunate in that I WFH, so I could allocate the time I'd have had to commute to school, figure 90 minutes a day. I'm married but have no children, so I didn't have that requiring my attention. Then I'd augment with whatever additional time was needed (at the expense of World of Warcraft).

I'd figure for a "light" class that had a fair amount of coding or was in a subject area that I had considerable experience would be 10-15 hours a week.

A semester with 2 classes of moderate difficulty would be 20-30 hours a week, depending on homework pacing, amount of videos and readings to study, etc.

The hardest class I took was my last class in December called Computability, Complexity, and Algorithms (CCA) and at the end I was doing 35+ hours a week trying to get ahead. It was hugely difficult due to my very weak math background, but I somehow got the hang of it and passed with a decent "B" and graduated.