Building A Toy Motor Slow Spinning Toy Solar Motor?

Slow spinning toy solar motor? - building a toy motor

I'm trying to build a value of 2-3 meters from the plastic sunflowers in a large glass case with rotation. In direct sunlight, these sunflowers just wanted to build a toy machine, but I do not know where the engine running very slowly (eg, complete a full rotation) receive approximately 30 to 50 seconds and can be operated by solar energy be - any suggestions on how I can keep going like this?