This is probably going to be different for everyone but about how long should it take before you can play all of the notes from low C to high C and still being able to control it?
I haven't played the trumpet for 12 years and when I did I don't remember being able to play up to high C well, but I never worked on developing my range either while I was in school - school never emphasized the importance of it. So now I practice a few times a week and working on just scales right now. Eventually I'll be practicing daily but its been hard to find the time, but thats no excuse for it.
So yeah, just wondering how long does it take to get good at that range. If I had to guess I would say 6 moths to a year.