My opinion is that it depends on the story.
No one likes it too dragged out if it doesn’t fit into the storyline.
(Unnecessary drama or extra villains/problems appearing out of nowhere…)
It doesn’t matter how many episodes it has!
If the story is done in 3, 5, 10-35, 50, or even 100+ episodes then it will be, it’s the author’s choice after all.
If the story is good, and the lengths of the episodes are also okay, then it really doesn’t matter!!
I prefer: minimum 5, maximum 25.*
(*Doesn’t mean anything, I’ve read much more/less before so…)
I’ve never read a story above 60 episodes, only because I don’t have time/passes for it. But when it’s vacation time, people will read a bunch! 
But short stories are also really great!! I also love them because I can sleep in peace at the end of the day!! 
Wow this turned out more than I had in mind… 
I hope this has been useful!