Jim Davis books in order
14 books in the catalogue, about 36 hours of reading in all; the shortest takes 1 hour and the longest 7 hours.
1 series and 13 standalone books in the catalogue.
Garfield
2 books Garfield at Large: His First Book length not known
Garfield: His 9 Lives 2.2 h Standalone books
Garfield at Large 2.4 h 
Garfield (2 editions) 3.5 h 
Garfield Pocket Books 2.4 h 
Garfield in the Rough 1.2 h 
A Garfield Christmas 1.3 h 
Garfield's Thanksgiving 1.2 h 
The Fifth Garfield Treasury 1.9 h 
Garfield Stories 1.3 h 
Garfield's Insults, Put-downs & Slams 2.7 h 
Garfield Classics 7.0 h 
Garfield Fat Cat 5.3 h 
Garfield Older & Wider 1.8 h 
Garfield Minus Garfield 2.3 h