Ok, cool!! Thanks both for answering!!
I might try to do that, but I dont think I'll be able to resist and not play it for 5-6 months when 0.6 gets released!
To maybe more directly answer - each update has given me about 3 or so hours of play time. I don't speed read the text or skip anything - I play at a "normal conversation" pace, not fast-talk, not slow talk, sounding out every letter, just comfortable. I also take time to enjoy the animations for more than a single loop (don't make MC a one-pump chump!
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When I add in potential variations and alternate routes, I get about another hour or so, depending on how many of those there may be to explore. For the time it generally takes to make an Eternum update, I think we get a nice amount of play for the dev time, particularly when you look at the quality of the renders, story and overall game experience (interplay of the music, expressiveness of the characters, mood of the scenes, genuinely good writing with very few typos to distract, etc.).
It looks like you've decided otherwise, but, if you are still considering depriving yourself of Eternum for 10 months to double that play time, it's your call, but I wouldn't.