A Book A Month

I'm looking at  GIDEON'S MARCH by John Creasey writing as J.J. Marric. The 1994 Chivers Press version of this 1962 book has a foreword by Donald Rumbelow.

Rumbelow tells us that over forty years John Creasey averaged about a book a month and some years put out twenty.

That's published words. Rumbelow goes on to say that usually Creasey wrote a book in ten days and spent five more days to edit.

I wonder how much he would have written with a computer.