The First 20 Hours: How to Learn Anything Quickly PDF by Josh Kaufman In this inspiring little book, author Josh argues that you can become good enough at anything that you enjoy it in just 20 hours. Between you and the ukulele is the time you're going to spend in front of the TV for the next two weeks, so if Josh, a busy dad and entrepreneur, can make enough time for himself, the rest of us can, too.