In praise of slow mastery: 10 great achievements that took time

In an ideal world, the road from idea to reality is proven and predictable, with a distance made fathomable by visible benchmarks.

But great things take time. A lot of time, in some cases. Just ask Avatar director James Cameron, or Brooklyn Bridge designer John Roebling.

Carmel Hagen lists her 10 favourite time-consuming achievements at 99U.com.

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