When the results were tallied, nearly half had said they’re willing to drop an anime after just one episode.
By the time you account for opening and ending credits, plus commercial breaks, a single anime episode usually ends up only being about 20 minutes long.
The barrier of entry for watching anime is extremely low in Japan these days.
Given that ease of access, you might expect fans in Japan to be pretty forgiving of anime that gets off to a slow start.