Episodes in an anime series tend to last around 24 minutes, with roughly 1 min and 30 secs reserved for the opening and the ending supposing the opening and ending is present in the episode (some seasonal anime that can afford to do so will leave more space for the actual anime and omit the openings and/or endings in that episode). There are also anime movies. And then there are weekly anime like Naruto and Black Clover, which have by now ended (Naruto) or are on haitus (Black Clover, probably), or are still going (like One Piece which are typically shounen anime. Such anime tend to have more fillers to avoid the anime catching up with the manga and will have openings and endings in each episode, and possibly some recap bits or recap episodes to take up more time so that less of the episode requires new animation. This is due to time, budget and staff number constraints as well as scheduling and more internal issues with some companies.
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