How long does one have to wait before buying whiskey from a Jew that did not sell his chametz? Is whiskey different than any other chametz?
There is no fixed time that one has to wait. Whiskey is chametz gamur, absolute chametz, and therefore one must ensure that the whiskey one purchases was not in the possession of a Jew (and not sold in mechiras chametz) over Pesach. Bottles of whiskey can remain in storage for a lengthy time, so when buying from a non-religious Jew one should be wary of this issue even a lengthy period after Pesach.