I've recently begun taking lessons from a trumpet professor at the college I hope to attend in the fall. The first thing he told me was that my tonguing style was awkward. Apparently, my tongue was striking forward and not operating like a valve (moving up and down). However, after I had started trying it the new way, I discovered that my sound, endurance, and speed had all been drastically reduced.My mom wants me to perform a senior trumpet recital in about two months (a full hour's worth), and I was going to do it, but I can't hold out anywhere near that long now, and i don't know if I'll be able to do it in two months, or even three or four. When should i expect my endurance to pick back up?