I know from personal experience that I really only truly tire when I'm not taking care of myself physically or am being too casual with my breathing. That being stated I know how it feels to have "dead chops"... I recently just did an eleven hour recording session for a blues band. It was incredibly taxing (constant High G's and A's) ... but paid EXTREMELY well
The next day I had a 5 hour "disco band" gig where I basically play as loud as I can all night.
I made sure I took my L-Lysine (an amino acid that supposedly helps in tissue health around the lips), put Arnica cream (recommended to me via Wynton as something that soothes sore muscles) on my lips, and drank a ton of water.
The next night before every phrase I thought about taking relaxed inhalations as well as letting my air do the work. It did work as my playing felt effortless, even with "dead" chops.
I experience this all the time, playing hard shows after another... but if I truly think about what really drives the trumpet (AIR and proper velocity) I can play so much easier.
Hope this helps!
Best,
Trent
PS: I should print this out and put it on my music stand every night!