Each film is different. Time Code was very quick - a matter of months. Miss Julie has been on my shelf as a script for some seven or eight years. But then the shooting process was very quick - 16 days.
If I started at 13, by the time I was 14 I was already good enough to play in front of people. I started off playing drums when I was 5, so playing in front of people didn't matter - not a problem.