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PI Coresight actively monitors the ProcessBook import directory and actually does not crawl on a schedule. Whenever a new file is detected, the event is raised in Coresight and the display is imported. You should be able to see that when a display is added to a properly configured import directory, the display shows up in Coresight almost immediately.
You can add import folders and verify configuration in the "Display Management" tab on the Coresight Admin page. As for your second question, any errors thrown when trying to import a ProcessBook display into Coresight will be thrown to the OSIsoft-PISymbols event log.
Let us know if you have further questions!