It varied a lot for me. The early ones I was generally able to do in 10 minutes or less. The middle ones generally took me 30-60 minutes - or I was blocked an

It varied a lot for me. The early ones I was generally able to do in 10 minutes or less. The middle ones generally took me 30-60 minutes - or I was blocked and it took me a lot longer. The later ones generally took an hour. But - I wasn't just trying to solve them, I was also trying to write tests and refactoring when I was done - so ymmv. I also wasn't ever attempting to compete for the leaderboard.