It depends on how much you like to browse.....I would plan a day of it. Lots of food a DVD walking.
If by world tour you mean the World Showcase at Epcot, it's about 1 mile around the lake. If you view the shows, each will take between 10 and 20 minutes to view.
All day at the park, if you want to see everything in just the World Showcase area. If including the Future Land, try extending to a day and a half maybe, especially if you have smaller children.
If you want to see everything, maybe a day. I spent a day and fid not have the chance to see everything.
It needs a whole day for me.
About a 1.5 miles.
It's about a mile.
All the park maybe 6 hours
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