In the US, full-time minimum is typically 12 semester hours (credits) - that is, 12 hours in the classroom per week. In practice students often take 12-18 credits, and are considered overloaded at 20+ hours - some institutions require approval to exceed a certain enrollment.

I had multiple semesters while attending a California State University campus where my classes stacked up on Monday-Wednesday-Friday, and depending on lab schedules I'd wind up having Tuesdays and/or Thursdays "off", usually taken up by part-time work or projects. Most of my classmates in the ECE department spent their spare days in a similar fashion.

So, no, I was not attending class on a "daily basis". And personally, I've learned far more from professional development, personal projects and self-teaching than I ever did in the coursework for my engineering degree.