1972,
It's unfortunate that you experienced this wing drop. The aim of the stalling exercises is to absolutely drill into you the recognition and correct recovery from a stall, so that you hopefully recognise the stall before it happens, and if by some chance you don't you then automatically use rudder to prevent yaw which in turn will prevent any wing-drop from developing. These must be instinctive reactions if you are to avoid scaring yourself like this again!
The answer to your question is that, if you can not carry out the correct recovery instinctively, you have not finished the exercise. There is no set time that it takes to complete the exericise - in fact, before JAR, there was a requirement for a minimum of 2 hours of stalling, so your 1.5 hours so far are certainly nothing to be ashamed of. Good luck in learning to be a safe pilot!
HappyJack,
I can not disagree with your post, but I don't think it's very helpful. People (including students) fly different aircraft at different weights all the time, so learning a particular stick position at which the stall occurs (and bearing in mind it will also change with flap settings due to the different AoA required, and, I think, power settings due to the effect of the power on the elevator) is not helpful. The only reason I cn think of why it is helpful for a PPL student to know that the stick position is important in determining when the stall occurs is because, as you rightly say, some forward movement of the stick (assuming it's not an inverted stall) is required on the recovery. But the aim of the exercise we teach PPLs is to recover with minimum height loss - and to achieve minimum height loss, more is required than simply moving the stick forward.
The "Falling Leaf" is of very little benefit to PPL students, and has been discussed enough on this forum recently to not need to be discussed again.
FFF
--------------