My daughter went to full day kindergarten last year and I have my second daughter going next year. I honestly don't like full day. I think they are too young. I wrote a letter to the board of education to express my concerns. Their reply stated that Maryland started the full day kindergarten as part of their new program, Bridge to Excellence. The Bridge to Excellence program began to meet standards for the national "No Child Left Behind" Act. I have relatives in PA and they do not have a full day kindergarten where they live. I know that several private schools in the area also offer half day kindergarten. It costs a lot. Last year when my first daughter went into kindergarten, only the first part of the day was spent on academics. From about 9:15 to about 10:45, they spent time on the rug, learning that day's concept. Afterwards was recess, then about 20-30 minutes of breaking into smaller groups to do various supervised activities around the room reinforcing the concept taught that morning. For example, they would complete simple art projects, ditto sheets, or short educational games. Then they went to lunch. After lunch they didn't do much academically, because the children start to loose focus. They go to a special(gym, art, music, or library), they may have another recess period, and they may complete some of the morning activities. I still don't necessarily agree with full day school at such a young age but I suppose there are some benefits. You may also want to consider homeschooling. I would voice any concerns you have to the Board of Education. Watch your child next year and see how he adjusts. The teacher will have lots of ways to communicate with her, I am sure. Write a letter or email her about anything your son has problems with. Good Luck!
Our school day starts at 9AM and goes until 3:25PM.