Answer: Sorry about the broken link. Here's a different website with information you can print off and keep: http://pubs.caes.uga.edu/caespubs/pubcd/L291-w.htm
The bottom line is - experience will teach you when your veggies are ripe. So, use the guide at the above web address and in no time at all you'll be an expert!
Your lemon cucumbers should be ready to pick when they are about 2" or 3" in diameter and still a light yellow. As they mature they will turn a deeper yellow and the seeds will be hard, which detracts from their flavor.
Best wishes with your veggie garden!
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