Each Final Fantasy 7 Remake episode will be as large as one Final Fantasy 13 game

That's way bigger than any episodic game I've ever seen...

More details about the upcoming episodic Final Fantasy 7 Remake were revealed in the latest issue of Game Informer. We've known for a while now that each episode will be as large as a full scale game, but we now have a bit more clarity on how Square Enix is going about that. According to the game's Producer, Yoshinori Kitase, the Final Fantasy 7 Remake will use the Final Fantasy XIII series as a blueprint for how the company will release each installment.

Said Kitase:

It will essentially be a full scale game for each part of the multi-part series. In XIII, each installment told the story from a different angle. It was kind of like approaching an unknown territory in a sense.
Whereas with Final Fantasy VII Remake, we already have a preexisting story, so it wouldn't really make sense if that isn't encompassed in a multi-part series… So if we're just looking at each of these parts, one part should be on par with the scale of one Final Fantasy XIII game.
There's still no word on how many episodes we will see, but given that the company is leaning on the Final Fantasy XIII formula, it stands to reason that this could very well be a trilogy. After all trilogies aren't exactly unheard of these days.
It's also reasonable that we aren't likely to get the first episode anytime soon, as all that's really confirmed is that the first scenario of the the first episode is complete and that the game will either be an explorable sand box or open world.
In any event, 2016 is going to be the year of Final Fantasy XV, the latest main entry in the series and a "theme park" attraction as described by Game Director, Hajime Tabata.