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1:09 PM
I've made an experiment to see how often questions are deleted.
I have downloaded 1000 posts using this script.
I went from question 308000, which was posted 2013-02-19 11:48 to question 309000, which was posted 2013-02-20 11:11. So this range covered almost 24 hours.
It seems that 14 questions have been deleted. You can judge for yourself whether some of them look suspicious. (Like someone using MSE for his homework assignment and then covering tracks.)
 

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