Thanks for all the comments and insight - It certainly seems worth bringing up in a casual non-confrontational way. I just didn't have any point of reference to compare against so wasn't sure if my expectations were too high or not. I don't really want to move schools - I like the place but I just want a little more time. I'll have a chat with them next lesson.
I also just want to be clear that I'm not trying to beat up on the school. I don't think they're intentionally trying to offer a bad service or do anything shady and I'm sure they've trained hundreds of good pilots over the many decades they've been there. The instructors and staff are friendly and helpful, the prices are reasonable, aerodrome condition is good etc. I have nothing to complain about other than the lesson times and maybe quality