What changes the handling answer
Do a few clean repetitions, reward well, and stop on an easy win. Several short sessions beat one long session.
Watch the bird, not the clock
If the bird looks away, walks off, starts biting, freezes, screams, or stops taking rewards, the session is already too long.
Match the skill
Recall, step-up, carrier work, and taming all need different pacing. Harder or scarier skills need shorter sessions.
Keep rewards tiny
Small rewards let you train without filling the bird up or turning the session into a meal.
Best ending
Stop when the bird just succeeded and still wants more.