exactly a month
I wish I could learn to fly in 31 days! What a fun game. The only problem I had was that you ran out of things to spend money on pretty fast. I didn't notice much difference with air resistance or ramp height. The rockets and glider were the big difference.
Still a great fun game. I love these kinds of games where you have to steadily upgrade to get better and make the game much more fun. Keep making them! 5 and 10