How long does it take to create an overnight success?

How long does it take to create an overnight success? For John Hanke it’s taken him 20 years to create Pokémon Go.
This week, the Pokémon Go app has broken all records, with 10 million+ downloads in the first week, exceeding Twitter in daily active users, and with higher average user time than Facebook, Snapchat, Instagram & WhatsApp.
How did John Hanke create such a massive overnight craze? Here’s the 10 times he levelled up in his lifetime to reach Pokémon Go:
1st Level up: In 1996, while s...