Myb4 years were kinda weird. I had 1 really solid year the first year it was taught at my school. Then the teacher got a better job offer elsewhere, so they brought in a new teacher that sounded like he would be awesome, because he used to teach Latin on TV! Turns out he had scripts then and didn't know shit about Latin, and we didn't actually study Latin at all my second year. Like: we had the class in a computer lab that was used by the language classes because of the software for the Spanish and French classes, and we spent a year playing Starcraft instead of studying Latin.
They fired that idiot, and brought in a new teacher that was excellent, but so many people had dropped out after the insanity of the second teacher they ended up combining the Latin II and III students into a single class. And since the Latin II students hadn't actually been taught anything, so my Latin III AP class was just intro Latin I again.
So in 4 years of classes I studied 2 years of Latin.