I don't have much beef in this overall dispute, but I thought I'd mention that my high school evolutionary curriculum was about three weeks to a month long and I sure do hope things haven't slid downhill that much since then!
Mine might have gone all the way to a week or two when you include the peas and some other incidental, but little of that was evolution itself but merely stuff related to evolution if you wanted to look deeply, and it definitely wasn't the 12 week course (60 lessons, I counted) in the ENSI outline WildTurkey is linking to. The ENSI outline would be an excellent course on evolution, but there's no room for that in a 34ish week school year, there's frogs to disect and plants to play with and all kinds of other stuff that's expected to be in a bio class.