So I just typed THE END at the end of the last book to the project that emerged from a little one-shot story I began writing in 1998, and it turns out that The Laundry Files/New Management runs to just over 1,710,000 words.
It's actually longer than WORM by Wildbow.
It's more than twice as long as the English Standard Version of the Bible.
It's more than three times as long as The Lord of the Rings.
(And, subject to some editing/polishing/reworking, it's finished. For now, anyway.)