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The Nintendo reps said it would last more than 70 hours without collecting much. Even without a guide I can't see the game lasting more than 50 hours if I play it straight through without stopping for heart pieces, bugs, and poes. I do agree it could be a very lengthy game without a guide, and I plan on clocking in some hours on fishing as well, a part of the game I have hardly touched.
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I don't know where you're getting that from. What I heard from Nintendo is that their testers took 70+ hours to get through the *entire* game, including all peripheral side quests and items. It didn't say that it took 70 hours without collecting much. Maybe there's a press release I didn't read.
I can confirm that without any guidance catalogues, it took me about 73 hours to finish the game, which includes finding all heart pieces, etc. There are some places that were pretty difficult for me, such as trying to find all of the bugs in Kakariko village, or having to catch a reekfish just to catch its scent and follow it. I can't tell you how many times I caught that fish only to lose it immediately. I thought it was some cruel joke until it dawned on me that that's what was supposed to happen.
All of these types of things would be exceedingly easy (and short) if I had a guide in front of me telling me where to go next, or a FAQ to help me get out of parts where I was lost as to where to go next. That doesn't mean that everyone will take 70+ hours, but it's certainly not a "lie" to point out that it did for many, including Nintendo's testers.