Why most Japanese animê openings and endings are 90 segundos while English animê openings are usually 30 or 60 seconds? How can companies do that?

Typical animê televisão episodes broadcast on network Japanese televisão 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 segundo opening puts mais content between commercial breaks than a 30 or 60 segundo opening, which may be less annoying for viewers to watch.