Since children are learning all the time while awake I would do 30 minutes in the morning and 30 minutes in the afternoon max.
When they are all there I would start/have circle time. Which would include some music/song time and being active. A couple of minutes where you did a chart about the environment/weather. Then I'd include the color of the week, the number of the week, the theme of the month, all those things you are concentrating on. Then go have play time. In the toys you can incorporate the theme of the month/week too.
For instance February:
Colors of the month: Red, white, Pink
Numbers of the month: 5, 6, 7, 8
Themes of the month: Heart, Valentines, Dental, Post Office
Using The Mailbox Preschool curriculum you can buy at just about any regular office supply store I'd make all kinds of crafts and foods that follow the theme.
Organize February now: Has a bear hugging a heart on it.
http://www.theeducationcenter.com/tec/afc/books/TEC60970/...=
Table on contents:
http://www.theeducationcenter.com///Images/dlr_images/pdf...
The skills you'd be teaching using this curriculum out of this book this month:
http://www.theeducationcenter.com///Images/dlr_images/pdf...
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The Mailbox curriculum books:
here's a list of some of the ones I have:
http://www.theeducationcenter.com/tec/afc/books/basic/sea...
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There are many many many resources through this curriculum. I would go to the local office supply store and find out if they carry them. I'm not talking about Staples or other big chain companies. But the local ones that do deliveries and give businesses discounts for ordering their office supplies through them. They will have the better books and prices too.