I think I need to develop my own important ratio, and it needs to deal with my time planning and evaluating lessons and student performance. It could go something like this:
BTW, if I told you how I finally got an equation into blogger it would go something like this.
So, thing is, every single one of my classes is unique. I never have the luxury that some other teachers seem to take for granted, that a lesson plan can be reused for several lessons the same day or week. On average I teach 15 hours per week, which would have been 18 if I had been working full time instead of just 80%. I have about 1 hour available for each hour of class time - this hour needs to include planning, preparing, printing, evaluating, feedbacking, marking, and getting to and from class. In reality, I work about 130% of what I get paid for.
This is pretty common for teachers in Sweden, although in larger schools sometimes teachers will have several groups who take the same course. Some schools, mostly charter schools, will make teachers teach 22 hours or more each week, and give extremely little time for planning. In those kinds of situations, trying to design WCYDWT and similarly ambitious lessons is just absurd. Which is why it's great that there is a growign library of these lessons online.
What's it like in the US and elsewhere?
How many hours do YOU teach, how many are unique, and
How much time do you have to prepare and evaluate each lesson?
Edit: I just googled "how many hours per week does a teacher teach?" and the answers from the US are saying about 25 to 34 hours per week. Is this true?!