The game is currently averaging about 6.5 new photos per day.
Some are accessing during the day(work), some at night and a few throughout.
And this will be the 124th image.
I do think, to last, it may reduce to 1 or 2 a day.
People may feel reluctant to answer or post if they know they will not be around, or don't have photos at hand.
In some ways, delays due to absence may help string it out - and leaves people to discuss the photos at more length.
The difficulty also varies a lot, but I think that can be a feature of the game - testing some who like a challenge, while allowing others to contribute quickly.
For now - apart from some long breaks during the day, it is going steadily.
This panorama may be a bit harder - see if you can identify the peaks.