Redstone chest> Teleport with delay?

I'm just trying to build an adventure map in Minecraft and now I want to build something like that, when I open a certain box after a short delay. How can I achieve this?

You put a Redstone comparator to the chest and behind it so many amplifiers, how long you want the delay. Behind it, you'll see a Command Block with the Teleport command and then the game will be teleported.

OK thanks