I have been teaching Aviation English for one full year in the French Air Force.
The majority of my students had little Aviation English knowledge before begining their training. They had several hours planned each week (I think it was 4) during their first phase of flight training as well as during initial ground training and later specific flight training (i.e. Transport or Fighter).
I thereafter qualified as a JAA CPL/IR ATPL and observed that my fellow students had about the same Av. Eng. skills but they were free to study Av. Eng. whenever they wanted, either during the ATPL Ground School, either beetween ATPL and CPL/IR flight training or even after!
Feel free to send me a private message and... good luck!
FLEXJET