From Build-It-Blocks, 
1) Build the Clock Gear Trail in Spin, Rotate, Twirl
2) Build the LEGO Platform Structure in Presenting Projects

Build an hour wheel and a minute wheel or
build hour and minute hands and numbers.

Robolab Program Idea #1.  What is the problem with this?

Robolab Program Idea #2.

How can you dedicate an accurate timing routine that sends messages
or detects when the cuckoo should come alive on the hour?