Nope! You can use more than 1! I used 2. And there are a few really cool ones that have the whole story of the morning, with the 8am photo highlighted.
By coincidence, I'd already taken a photo a few moments after 8:00 this morning before seeing the challenge, LOL. MOC5 day 11 by Aerobigirl posted Jan 11, 2017 at 10:00 PM
I was working, and actually we were live on the air at 8pm, so I took my picture a few minutes early.
At 8 o'clock I was busy labeling the new foodcontainers for all my healthy snacking and baking products!
Here's mine. I couldn't think of what to take a picture of at that time of the evening, so I went outside and looked around. So glad my camera can take good night shots without flash.