10 Lemons a Day, Is It Safe?

Is drinking pure lemon juice from 10 lemons everyday safe, was wondering if there are any downsides to doing so.

If a person eats a steak every other day and eggs every day would the lemon juice make the high protein easier to digest? Would even twice as much be safe, say 20 lemons a day? This is without adding water or sugar. Is it safe to have more? They equate to about 2 cups of pure lemon juice per day. And they'd be organic also.