1) Endurance comes with efficiency. Inefficient use of the air, lips, embouchure, etc can cause poor endurance. The best example I can think of is a trumpet player who plays with a small, efficient aperture is going to have more endurance than a trumpet player who plays with a larger aperture. Practicing "poo" attacks with the lips starting together and letting the air open the aperture can help. Just do a couple minutes of this each day--it doesn't take much to get a benefit.
2) Practice endurance. Open Robert Getchell's Practical Studies for cornet and see if you can get through a 4-line etude without losing the focus of your aperture. In grad school, we played down lots of 1-page and 2-page etudes. That's a ton of playing without any break.
3) Rest often. Up to 50% of your practice can be singing or mental practice. If you are practicing 30-minutes a day and your lips never leave the mouthpiece, then you are going to cause yourself endurance issues. Take significant rest between each exercise or each permutation of an exercise.
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