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Re:How to Lose $81,000 in Bitcoins by ghshephard on Wednesday June 01, 2011 @01:39PM (#2608358)
Also - always wait for your wallet to show at least five (5) confirmations before being (reasonably) certain that your transaction has committed.

General rule of thumb is it takes about 60-90 minutes to be guaranteed that your bitcoins have transferred.

Re:How to Lose $81,000 in Bitcoins by bdonlan on Wednesday June 01, 2011 @05:25PM (#2609423)
This is more a rule of thumb for the receiver; if you send a transaction (based on coins which are already well-confirmed), and don't try to send any conflicting transactions, then it shouldn't disappear as long as it gets one confirmation (even if the block chain forks, it will be resubmitted)