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To expand a bit on John McLeod's answer: After the expiry date, the server assumes it's not going to get an answer back, and gives it to another user for processing. As mentioned elsewhere in this forum, results for a particular work unit are not "accepted" until three different users have processed it and given the same answer. (Also, no one receives credit until this happens.)
Presumably, increasing the deadline would just slow the whole process down, and the whole project is oriented around the assumption that the vast majority of supporters connect fairly frequently, and any caching is more to get around temporary server or network problems.
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