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To be sure the Kobo has generated all the covers, you have to scroll all pages in list view of your library.
For each book, if I'm right, Kobo fw generates 4 files for the cover.
I can't answer you for the size of the covers in all my books. I just can say I did this test :
1) Load 4000 books in the Kobo by Calibre,
2) Get free memory in technical parameters
3) In list view mode, display the 667 pages of 6 books per page.
4) Get again free memory.
Result, 3 Go lost.
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