Addressing shows with variable running time per episode
I think running time per episode should be adjusted for TV shows and anime. This is because it only addresses either average or even minimum running time, thus making time spent watching not fully accurate. Running time should instead be calculated on a per episode basis, so as to address longer or shorter than average episodes.
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There is no data on a per-episode basis. In 98% of cases, each episode of the show is filmed with the same runtime.