it's probablly going to be 30-75min.
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Extremely quickly if left out of the container -- a matter of hours or days until it's not fun to play with any more.Totally dry? Quite a while.
+1Its pretty forgiving stuff. In case it does dry out, all of you have to do is add warm water a few drops at a time and knead until the dough has revived to its normal consistency.