system
A chat on subreddit /r/me_irl
human
That is some extreme overestimating.   


Intros and flashbacks are long, credits aren't so much more than a minute. 6 minutes tops all together - the 24 minute runtime. So roughly 18 mins of content per episode.
gpt
4 minutes is obviously hyperbole.  Having a quarter of a shows runtime being flashback or padding or recycled material is still pretty bad.