I believe that would be equal to 2 large eggs, as Kitchen Dictionary says 1/4 cup of egg substitute is equal to 1 large egg.
Here are a couple of web sites you may find interesting as well:
With the brand Egg Beaters, 1/4 cup equals one egg.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them