My school has a block schedule, in which you have three periods a day, with two different blocks that alternate every other day. For example, if I have one block ("A" Block) Monday, Wednesday, and Friday, I'll have the other ("B" Block) Tuesday and Thursday. The next week will start on Monday with the "B" Block.

"A" Block
8:30 AM - 10:10 AM: Advanced Placement English 12
10:10 AM - 10:50 AM: Tutorial (Free Period for studying/goofing off)
10:50 AM - 12:25 PM: In Work Experience (Teachers Aide/Homework time)
12:25 PM - 1:10 PM: Lunch
1:10 PM - 1:25 PM: Sustained Silent Reading
1:25 PM - 3:00 PM: Art II

"B" Block
8:30 AM - 10:10 AM: Physics
10:10 AM - 10:50 AM: Tutorial (Free Period for studying/goofing off)
10:50 AM - 12:25 PM: Govenment/Economics (each is a one semester class)
12:25 PM - 1:10 PM: Lunch
1:10 PM - 1:25 PM: Sustained Silent Reading
1:25 PM - 3:00 PM: Advanced Placement Statistics

On Wednesdays everything is shortened a little so we get out at 2:00 PM. I have no idea why, but I'm not going to complain.