It's interesting how in filmed stories there are the 2 main types - movie and tv series, where the shorter movie seems the more serious/central/important/prestigious etc form, the opposite of the situation with short story/novella vs novel. That's just from the historical accident of people seeing movies in cinemas, and series on TV, I guess.
70min movies can work fine - the 68 min Detour (1945), one of the first noirs, doesn't seem too short at all. Rick and Morty at 22 or so minutes does more than most 1 hour tv shows - an hour at that pace might be too much. Also, it seems that in the first decades or 50 years of cinema, plenty of 10 and 70 minute stories were shown, but recently you get the 'main feature' and nothing else.
70min movies can work fine - the 68 min Detour (1945), one of the first noirs, doesn't seem too short at all. Rick and Morty at 22 or so minutes does more than most 1 hour tv shows - an hour at that pace might be too much. Also, it seems that in the first decades or 50 years of cinema, plenty of 10 and 70 minute stories were shown, but recently you get the 'main feature' and nothing else.