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I think it will take as long as the time it takes you to get bored.
Once you past the surrounding mountains, you'll probably see more mountains, and they'll probably just keep reusing assets and randomly position them in front and around the player as he/she moves forward.
What worries me is that there may be nothing but trees and mountains beyond that, thus no point in going further. I hope they at least make a quest/mini-game out of it. The farther you go, the stronger the enemies get, and you get a required each time you pass a "level".