Haha, I've been a bit spoiled lately, my studies have been a breeze. They have been so easy I haven't needed to put any time or effort into them, this season things are a changing, they actually seem to be changing so much I was at the verge of getting myself some time tracking software just to make sure I'm not studying overtime, then I realized, why? If I'm studying overtime, so what, I'm learning, that's why I chose to study things in the first place... right? Anyhow, I threw together a quick 'formula':
8 hours each day, 5 days a week, 4 weeks = 160 hours
160 hours each month, half a year (one semester) minus one month for vacation (5 months) = 800 hours
A 7,5HP course is a quarter of "full-time" studies, so that's a fourth of 800 hours, 200 hours.
They say 200 hours, so I guess they're using the same formula as I am? Really, this is my formula, I have no idea how they count, just thought it would be a bit more complex.