Hi Bruce,
The process can be run multiple times and should only attach the documents once. As long as people are not renaming the files manually in the SoftPDF Folder, they will only be attached once.
I think (although I might be wrong and someone can correct me) that the process will take approximately the same amount of time for each invocation. Most of the work is in deciding whether to attach a file, not the actual attaching itself. And all million GL transactions will be scanned each time.
Glad they like the functionality! Sorry the process takes a while.
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Andrew Bates