User blog comment:Bowl108/Signs Point to Phineas and Ferb's next season to be their last/@comment-5237996-20120521014834/@comment-961279-20120522023848

Disney really stretches out when they release new episodes. By my estimate, "Meapless in Seattle" was probably completed about about a year before it finally premiered.

This is based on the fact that it takes about 10 months to make an episode and we first heard it was an official episode at Comic-Con International in July 2010. It was already being worked on when this was announced, so 10 months after July 2010 would be April or May 2011 and we didn't get to see it until April 2012.