I'm 40 hours in and still haven't started chapter 5. I'm taking my time exploring (Primordia and Noctilum only, I want to feel at home in both before I go to the other continents).
I'm also slowly memorizing what the buff/debuff icons mean, and everyday I learn something new about the mechanics. I'm enjoying this so much that I don't want it to end, so I'll keep playing very slowly, learning everything I can about the world and the systems. Hell, I'm even reading the descriptions in the bestiary...
What's interesting about this game is that, if you take this slow approach, you really start to feel like you're living in Mira. As the days go by, you meet new people in NLA, learn new things about this alien planet... I mean, I love Zelda games and played many JRPGs, but even though it takes a while to beat them, they never made me feel time in such a real way. They're like "an epic adventure in a day", while Xenoblade is an entirely different beast. What an amazing experience.