Conversation so far:
What is Phineas and Ferb?
Phineas and Ferb is an American animated musical comedy television series produced by Walt Disney Television Animation.
When did Dan Povenmire work on the show Phineas and Ferb?
August 17, 2007 - June 12, 2015
Was Dan Povenmire the creator of the show Phineas and Ferb?
Yes
What was Dan Povenmire's position in the show Phineas and Ferb?
Creator, director, and executive producer

Question: For how many years did he work for the show?
Self-contained rewrite: For how many years did Dan Povenmire work for the show Phineas and Ferb?