Limit to the number of files Recuva can process

I'm trying to recover a large number of deleted files from a NAS device. The scanner gets to 8581237 files (9%), then resets to 0% progress and seems to freeze. The number of files does not change. Should I just wait, or has Recuva hung?

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I don't think that there is a file limit, apart from practical considerations. Mind you, if 8.5 million files represents 9% then I think you might be hitting those practical considerations. What edition of Recuva are you using? Network?