How much juice is in a lemon? (recipe substitute)?!

How much juice is in a lemon? (recipe substitute)?

I am making a recipe which calls for the juice from 4 lemons. Instead of buying fresh lemons I bought a bottle of lemon juice. How much should I use?

8 hours ago
Thank you everyone. You're so helpful :)

Im making Chicken Mozambique :)

Any where from 2 to 3 table spoon fulls for 1 lemon. I would use 2 just to be on the safe side. That should be enough to add taste to it, and if you are to use the juice of 4 lemons put in about 6 to 8 table spoon fulls. That should be enough. I hope it turns out good!!! =)