Can you please share an example how you used it ?I am working in the same way but i am not getting the Expected result.
In one of our cases, we need to assure that a particular FTP task finished in a timely fashion. If it does not finish on time, then we send an email to staff alerting them to the delay. To accomplish this we built a new workflow with one email task and this precondition rule so it will only send the alert if we are late. The 45 minute rule is unique to this particular use-case... you will need to adjust your precondition rules accordingly.
Thanks Pete for your Information and will make a try in the same way.