Okay, so the level takes about 2 minutes to complete. You will get a gold medal if you beat the level in 110 seconds, and a silver if you beat it in 114. This level is definitely one of the harder ones, and you must be precise with your movements to succeed. It took me a few tries to get it right myself.
Here's a tip:
At 2 points, there is a 2-way ramp which you can use to get to and 
travel along the sides of the level. This can defitiely save time.