I didn't set a rule for how many photos on a layout, I just did what felt right for that time period, so in my album there are quite a few pages where it's a single week and then I did some that are a series of months. I really like how the album turned out, it's interesting and I didn't buy specific supplies so it made a fair sized hole in my stash.
I also discovered a great app, Project 365 Pro which I'm going to use for next year as I think 2015 seems like a nice round number to have another go and it'll be easier using my phone than carrying a camera around. You can even output the monthly file from the app as a single image which looks great for a layout.
Anyway, here's a few pages from my album just to give you a flavour.
Sorry about the reflection on this one, just couldn't get rid of it.
See what I mean about it being interesting?