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@Elwynd02 - you're conflating when the database (metadata.db) is updated after a bulk metadata download and when the backup metadata (metadata.opf) for each book gets rewritten.
As I've posted in your other thread - I believe the database is updated when the review is complete, that happens lickety-split.
The rewriting of the metadata.opf files is slow in order that it doesn't hog resources, but if you close calibre down before its rewritten everything, then when you next start calibre the rewriting of the metadata.opf files will resume.
The need to rewrite the metadata.opf files can be triggered by many things, some are obvious - such as downloading metadata, others not so obvious - removing a tag will trigger an update to every book that uses the tag.
BR
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