@davidsuculum - It's depressing to me that I can't do it without including SF. I tried.

I read Proust's Remembrance of Things Past in the form of multiple separate volumes... does that count?

John Updike
Vladimir Nabokov
Fyodor Dostoevsky
Italo Calvino
Doris Lessing
Isaac Asimov
Ray Bradbury
Greg Egan
Stanislaw Lem
Ian M. Banks

#10authors5bookseach

Iain Banks (both)
David Mitchell (the Cloud Atlas one)
Thomas Hardy
Michael Moorcock
Ursula K LeGuin
Alan Garner
JG Ballard
Peter Ackroyd
Haruki Murakami
Gene Wolfe

#10authors5bookseach

#10authors5booksEach (10 authors you’ve read at least 5 books by)

Douglas Adams
Piers Anthony
Isaac Asimov
JG Ballard
Iain Banks
Iain M. Banks
Greg Bear
Edgar Rice Burroughs
William S. Burroughs
Octavia Butler

Well, that's A-B but I'm sure I forgot a few.

#10authors5booksEach (10 authors you’ve read at least 5 books by)

Octavia Butler
George MacDonald Fraser
Nnedi Okorafor
Neil Gaiman
Walter Farley
Louis L’amour
Alan Moore
Robin McKinley
Robin Hobb
Edgar Rice Burroughs

#Bookstodon

Mick Herron
Frank L. Baum
Crockett Johnson
George Orwell
W. V. O. Quine
Charles Stross
Terry Pratchett
John Grisham
Sue Grafton
Dana Hughes

#10authors5bookseach

I really liked the idea of #10Authors5BooksEach when I came across it on here a couple of weeks ago. So much so that I made the list of the authors I’ve most recently read a 5th book by a permanent part of my #books reading records on my website: https://nocto.com/books/5-book-club/

The count is currently 64 authors where I’ve read at least 5 books by each of them. I wrote a #BlogPost to introduce it too: https://nocto.com/posts/5-book-club/

Martha Wells
Graham Greene
Penelope Lively
Patrick OBrian
John Green
Martin Cruz Smith
Michael Chabon
Barbara Kingsolver
Michael Lewis
Ross Thomas

Honorable Mention Mystery Writers:
Janet Evanovich
Agatha Christie
Sue Grafton
Dick Francis
Tony Hillerman
Carl Hiaasen
Alan Bradley
Peter Lovesey

#10Authors5BooksEach

#10Authors5BooksEach
Kim Stanley Robinson
Patrick O'Brian
Gene Wolfe
Ursula K Le Guin
Charles Dickens
Ray Bradbury
John Le Carré
John Crowley
Terry Pratchett
Steven Brust

Plus J R R Tolkien, C S Lewis, Harlan Ellison, Lois McMaster Bujold, Iain Banks, George R R Martin, Connie Willis, Mark Twain, P G Wodehouse, Guy Gavriel Kay

#10authors5bookseach Took a bit to shake loose from the old gray cells, but I finally came up with a list.

Erle Stanley Gardner
Rex Stout
John Creasey
Colin Dexter
Lawrence Block
M.C. Beaton
Sue Grafton
Francis Durbridge
Dorothy Gilman
Ralph McInerney