There're many things for the kids to do after-school: lunch, sleep and rest, play at home and play in the park nearby..., many many, or you can prepare some books, artwork or educational CD for him/her to watch.
It's very important to have enough rest (both mentally and physically) if you want the kids to grow up with good health.
Think twice before you made the decision of putting your kids into 2 kindergartens ar!