As others have said, although there is technically a set lesson pattern, I think it can be interpreted to how the club/school wishes to teach. This is certainly the case in my club and we have extra training thrown in.
As to the number of hours, that again depends on your ability, how long a break you have inbetween each lesson and how your instructor rates your progress. Again, wiser heads than I have said here that you will not progress until you have reached a required standard in one area (and don't I know it!
).
Be aware also (and I don't think its been mentioned here yet) that once you have taken your first ground exam, the clock starts ticking. You have 18 months then to complete your ground exams and I believe a further year to complete your skills test (I sit to be corrected on that but I think I am correct).
So have a chat with a club and don't start with any preconceived ideas as they are bound to be shattered within the first few lessons! I've enjoyed my training much more now I have no timescales.
Good luck!