Prince EWS
Global Moderator
Trevor Goddard immediately springs to mind on this front too; 25 year Test career. Bloody good player too.Hobbs was similar to Tendulkar. His test career was around 23 years and I think he had 3 good first-class seasons before and after.
EDIT: Apparently I'm completely wrong and he debuted in 1955, so 15 years. That sucks.