I received my day-old chicks back in June. Between then and now I, like most other first-time chicken owners, have been watching the calendar and cruising the forums, desperately searching for that one encouraging post that says, "Everyone else is wrong. YOUR hens will start laying at 9 weeks old" Obviously, I never found it. 
I've also spent a lot of time trying to figure out how many eggs I should expect once the hens did start laying. Of course, "it varies" is the correct answer. I guess all I was ever really looking for was an accurate accounting of some hens' egg laying. With that in mind, and in order to quench my own thirst for data, I've been recording my egg totals since my hens started laying.
I have 9 hens, 5 Buff Orpingtons and 4 Australorps. I have a light in the coop on a timer so that they get about 16 hours of light per day. They get layer feed along with whatever table scraps are mainly protein. On my tracking calendar, the bold number on the left is the age of the chickens in weeks. I got my first egg on November 10th. The rest is fairly obvious. Each day shows the total eggs found that day. The end of each week displays that week's total. The monthly total is shown at the top, next to the month name.
Hopefully, this serves some use for you. I update it almost daily, so check back if you're curious about our progress.
https://docs.google.com/spreadsheets/d/1Tcp7N2PgKQLYfaE5cKGGew_0Pntue78lzuW7rMcCfy8/edit?usp=sharing

I've also spent a lot of time trying to figure out how many eggs I should expect once the hens did start laying. Of course, "it varies" is the correct answer. I guess all I was ever really looking for was an accurate accounting of some hens' egg laying. With that in mind, and in order to quench my own thirst for data, I've been recording my egg totals since my hens started laying.
I have 9 hens, 5 Buff Orpingtons and 4 Australorps. I have a light in the coop on a timer so that they get about 16 hours of light per day. They get layer feed along with whatever table scraps are mainly protein. On my tracking calendar, the bold number on the left is the age of the chickens in weeks. I got my first egg on November 10th. The rest is fairly obvious. Each day shows the total eggs found that day. The end of each week displays that week's total. The monthly total is shown at the top, next to the month name.
Hopefully, this serves some use for you. I update it almost daily, so check back if you're curious about our progress.

https://docs.google.com/spreadsheets/d/1Tcp7N2PgKQLYfaE5cKGGew_0Pntue78lzuW7rMcCfy8/edit?usp=sharing