Why most Japanese 日本动漫 openings and endings are 90 秒 while English 日本动漫 openings are usually 30 或者 60 seconds? How can companies do that?

Typical 日本动漫 电视 episodes broadcast on network Japanese 电视 have commercial breaks after the opening animation, in the middle of the episode, and just before the ending credits. With this broadcast pattern, a 90 秒 opening puts 更多 content between commercial breaks than a 30 或者 60 秒 opening, which may be less annoying for viewers to watch.