Roughly how many lectures do you have per year? Watch
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In engineering I'm in for around 16 hours a week (lows of 14, highs of 18-20) depending on what's going on. That's for 12 weeks in the first semester and 12 weeks in the second semester. There may be extra contact hours (2 weeks or so) for revision before or after the Easter holiday too.
The number really shouldn't matter too much though. You'll be in to do what you need to do.
1 hour for the seminar
But the work for the seminar far outweighs anything!
It really depends on the course.
7 hours of lectures a week (5 for 1 hour, 1 for 2 hours)
3 hours of seminars every 2 weeks
1 hour optional PASS sessions every week
So, anywhere between 8-11 hours a week. Not sure how many in an average year though. Definitely not as many as some of the other guys on here though!