the fastest way that you would have available to you would maybe be a kiln, or an oven. But like others have said, if it dries to quick, it will crack.
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I wouldn't try to rush it because it could split and your project will be ruined. I know it's frustrating to wait for it but it will be stronger in the end.
Other than a kiln?
put it out in the sun?
but that would cause it to dry unevenly
if you want quality, let it dry at room temperature it will take 3-5 days