It depends on which game. I've seen Link to the Pastbeaten in a couple hours, but later ones are a lot more complicated.
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It took 5 years.
It takes as long as it takes you to complete it. I think the fastest completion of it is just over 2 hours non-stop.
10 million years
it depends on what you do and how long it takes you to finish each level and boss.
It takes about 9 hours to complete The Saboteur.