An hour a week is about the minimum to allow you to get through your training without any regressive steps.
How many lessons are you booking at a time? If you are booking daily and only getting under an hour a month, then there is something very, very wrong. Not just for you, but if a school is only getting that utilisation, then they won't last long.
Have a word with the CFI and your FI, if you are getting on well with your FI and the school in other ways, then I wouldn't jump ship just yet.
Steven, I think it was every couple of weeks you flew when I was training you back in the mists of time at EGSR having just dug out my old logbook from then. That worked alright didn't it!