Many Western cartoon series have had original runs lasting 65 episodes, because 65 episodes equals 13 weeks (or three months) of material to syndicate at one episode per weekday.
This was typical with cartoons produced for first-run syndication, and adopted as policy by the Disney Channel (which has a similar 65-episode cutoff for its live-action Kid Coms) and Kids' WB!, although some syndicated [...] [tvtropes.org]