I am on session 9, too (and 19a attached). When I began this series, I wanted to be perfectly accurate and chose the day of a new lesson for the whole term of the therapy. But now, sometimes I let it "saturate" one more day or one or two days less.
This may be the key: I am persistent as much as I can as required but also a little free because I can't stand strict rules. I do not pay attention to the "half an hour a day" warning to be accomplished but I repeat as much as I can.
I like to play cards on my pc so this is another time for "audio practicing".
I write down the essence of the handouts each week, and read them instead of the handouts. This way I am not so bored, feel that I've done something, it is a bit personal, and not too long to read. When I feel I am going to give up, i just make another, even shorter note.
millenniumman75, if you feel like, you can write some sentences down from what you hear on the tape and repeat them. It will also do, handouts are almost the same as what you can hear.