<p>How is less than ten minutes better than ten to fifteen?</p>
<p>If you’re straining after ten minutes, either the piece is WAY too hard for you right now, or it’s something other than fatigue. </p>
<p>If you’re going into a recording session on fresh chops (which I can’t imagine you wouldn’t be), ten minutes isn’t going to be long enough to cause fatigue problems. Anything you do in fifteen minutes of recording is about how well you’ve prepared and what your playing is like. If you’re fracking a bunch of notes, it’s not because playing the trumpet is just so hard that you’re already exhausted, it’s because you either don’t know the music well enough to have it in your ear, or you’re not ready to play the piece. Fracks are certainly something that will happen for brass players, but if you know the piece well enough to be playing it with expression, you should know it well enough not to have accuracy issues. </p>
<p>Either way, look at it that this way. These schools get supplements from talented pianists and string players all the time, so much so that one really needs to be head and shoulders above to make an impression. Do you think they want to hear a trumpet player miss a whole bunch, even if, as you assert, playing the trumpet well is an impossible feat of godly strength? Not likely.</p>
<p>I say, let your All-State and similar accomplishments be what they are. If you think you can’t possibly put together fifteen minutes of impressive playing, no amount of your playing is going to be impressive.</p>