I agree with Legofreak. I usually take mine apart as soon as I photograph it so I can start on the next one.But come on.. lego is meant to be played with!
It usually takes several days to build a big castle. And then I tweak it for a few more days, rebuilding parts of it. Then I photograph it and take it down. The whole process usually takes about a week.
The exception was The Forge, which sat around for about 6 months waiting for me to photograph it. On the other hand, the Soldier's Barracks was built, photographed, and dismantled all in one day.
Stephen