Let me tell you, because I have a similar experience in making molds, but it’s not as miserable as yours. An adult’s fingernails are about 15mm, and fingernails grow 0.10mm every day. How long will it take for you to grow this whole empty shell? Is it complete? Let me calculate it. It will take about 150 days, that is, 5 months later, and it will be the same as before. I wish you good luck!