What to do with 20 zested Lemons?

I love Limoncello, the potent Italian lemon infused alcohol. And for Christmas I got a book with a recipe I decided to try.

But now I'm left with 20 lemons that I zested for the Limoncello. So here are my questions...

1. How long with the lemons last without their zest?
2. Any ideas on how to use these lemons soon other than the obvious lemonade?

Thanks SeriousEaters!

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