That got me thinking who were the most prolific artists at DC and Marvel and I came across these stats from 2014.
1. Curt Swan: 1415 stories; 18865 pages; 1012 covers
2. John Buscema: 813 stories; 17899 pages; 588 covers
3. Jack Kirby: 1326 stories; 17310 pages; 1634 covers
4. John Byrne: 735 stories; 15143 pages; 741 covers (probably more by now)
5. Gene Colan: 1148 stories; 14940 pages; 416 covers
6. Sal Buscema: 672 stories; 13517 pages; 348 covers
7. Carmine Infantino: 1053 stories; 12810 pages; 490 covers
8. Gil Kane: 923 stories; 11964 pages; 1556 covers
9. Ross Andru: 873 stories; 10669 pages; 543 covers
10. Dan Jurgens: 461 stories; 10556 pages; 432 covers (probably more by now)