Does anyone know anything about shellac nails?

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I'm thinking about getting my first shellac manicure tomorrow. In the past I've always gotten acrylics but they are so damaging! And after having them off a few months my nails are grown so I don't want to ruin them all over again. If anyone can tell me how long they last, if they can lengthen, and just general about them that'd be great! Thanks!☺