Stewie, a gray tabby Maine Coon, was 48.5 inches which is a half inch over 4 feet. He died in 2013 but remains the holder of the record for longest cat.
Longest cat William Lawrence Sr Omnibit 11-20-19
Longest cat William Lawrence Sr Omnibit 11-20-19
Unfortunately, that article doesn’t specify how much of Stewie’s length was body and how much was tail.