I'm a full-time student with a full 6 class workload every week. So far, it's only week 3 in the semester so things haven't gotten too difficult yet but I know they will later on.
And it's a pretty good major. In my first year, everyone from all of the different business-related majors (i.e. Accounting, HR, Finance etc.) were all in the same classes but after that (2nd year) you really begin to concentrate on marketing. Like, right now I'm doing an assignment where you have to sell a product to a board of directions and use this online website to see what will change if you do something. (i.e. Increase/decrease retail price, offer a wider variety, more advertising etc.)
I'm learning a lot and I find marketing to be a fun and rewarding experience. I'm also looking into taking an advertising program because one of my professors told me that both advertising and marketing are interrelated.