Most Animes are based on light novels and a light novel is no longer than 50k in word count as a fair standard in the industry (anything above 50K in word count is no longer a light novel).
Now Tapas has a limit of 15k LETTERS/CHARACTERS which roughly translates into about 4k WORDS for a general episode if maxed out to full potential.
This alone would make a light novel less than 15 episodes long with longer episodes, but if you stick to Tapas's preferred standard from the guidelines then you shouldn't write more than 800 words pr episode.
Again if you take the 50K and divide that with 800 you get a light novel lasting about 62 episodes.
Personally, I am doing about 1,2k words pr. episode/chapter (cuz every episode I push out contains a theme I go over, just like an episode in a webtoon would) and this will leave me with an estimated 41 episodes.
All of these things are very independent. You may think that the story you have is big enough to fill out a 100k word count but cuts down to 30k when written out and vice versa.