When
the student can keep his/her height within 200 of the required 1000 feet downwind.
Keeps the speed ABOVE stall at all times.
When you don't have to prompt their actions or radio calls.
And when they can land it at least 3 times without making you fear death.
The landings don't have to be super smooth/soft. Just good enough not to destroy the aircraft.
If you don't feel safe sending them, just let someone else do it.
1/60