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As each update comes out, the game doubles in size every time. I don't think it can happen this way forever or the game will need over a year of development eventually.
it was first a 1month, then 2, then 4 and now we are at about 8 months for each chapter. luckily this time the game is doubling in size, but only about 1 month increase in development time.
what i mean by doubling, i mean the game is doubling the render count, the animation count and story content. So while it seems like a long wait, the payoff is worth it.