We were stunned. Our granddaughters, Nintendo fans for a long time, were not impressed with the Nintendo land or rides. They just shrugged when asked about how they liked the land layout, never bothering to do any exploring. They were both 'confused' about what to do on Mario Kart, and didn't even want a second ride. But I talked them into giving it a second chance in late afternoon when lightening somewhere around Orlando, shut down all but three rides, and the line was short. Second ride, they still didn't care for it and again they said it's too confusing. Yoshii, they disliked. We thought they'd want to spend a lot of time there, but we breezed through both rides during early opening and that second ride. So, bottom line, maybe 45 minutes in the land, counting ride time, total.
We actually like the rides and land better than they did. You just never know, I guess.