A friend borrowed our electric citrus juicer, and has not yet returned it, so I just did half a gallon of lemon juice by hand with a clamshell juicer.
The phrase "easy peasy lemon squeezy" is hogwash.
The vendor, CulinarySolvent.com, says this is a quart of 100% ethanol, so this is roughly 1/3 zest. I've stopped zesting because we lent out our citrus juicer and I need to get it back, and I have too many peeled lemons at this point...