A large wildlife book, start to finish, could take one to two years, but then I would expect to get several good (nature) magazine features off the back of this, plus of course a lot of stock.
In 1989, I was on Tiananmen Square with the students, living in their makeshift tents and joining their jubilant singing of the Internationale. In the two decades since, each time that I have gone back, visions from those days seem to return with increasing persistence.