This is the probable daily schedule for either class:
8am, morning group time. Circle time. A time for them to do the weather, the color of the week, number of the week, etc...it usually doesn't last more than 20-30 minutes. Then they might go to the tables for some project, art activity, worksheet, writing, reading, etc...something class like.
Then they might have a morning snack. Then recess. They'll probably go outside or play in the classroom for a half hour. Then it's back in the classroom for some more education time until lunch time. Once they come inside that would normally be the time half day kids would go home.
The next thing the kids that are full day would do it actually go to lunch. They would go play afterwards for a few minutes but not too long. Then they would have rest time. They would be expected to nap each day or rest quietly on their pad until it is time to get up. They usually stop the nap/rest time after Christmas Break. Until then they encourage the kids to take the nap.
Once they are up they will have an afternoon snack and have some more scheduled time in the classroom. Most of the time the teacher had them sitting at the tables after snacks and the stayed pretty focused on stuff until it was either a play time or time to leave. They did have another time outside if the weather permitted.
I would ask the school specifically about the daily schedule for the classes so you can make an informed decision.