IGN: "horse ride from one side of Hyrule to the next is rumored to take 45 real min."

[Weltall]

I won't mind for two reasons:

1. There's certain to be a lot to see (which was my gripe with Wind Waker, and it's a valid one). What made the smaller Hyrule Field so neat was that there were lots of secrets hidden all over. The ocean had them too, but you had to use the fish guy and use maps and it wasn't half as much fun. If it will take me 45 minutes, I expect a full, lush world with plenty of distractions.

2. There's almost certain to be a warp system once the thrill settles down.