I taught elementary school, all grades, for three consecutive years for the board of education in Japan. My class sizes ranged from 40 minimum to 45 maximum. I saw each grade once a week for 50 minutes. Class size wasn't a problem (there were Teaching Assistants), time allocated to teaching English was the major problem.
If you're interested in finding out more about class size and its effects on learning, you might want to check out the B.Ed forums.
Try here, Home of Reduce Class Size Now. There are academic papers here, Teaching & Learning
This is what I googled, class size and learning - Google Search.
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