Just curious to know how long most photographers keep the images from each of their real estate shoots? Do they keep them all or do they just keep the deliverables? And if so, for how long?
Much depends on the volume of shoots you are doing and your style of shooting and if you register and resell your images.
If you are shooting high volume, most would argue that here's probably not much of a reason to have the images you shot more than 6 months to a year ago.
On the other hand, if you don't shoot high volume, given today's low storage costs, there's little motivation to develop a disciplined process for getting rid of old shoots. For most photographers, it would take more time and effort to go clean up and get rid of old stuff and decide what's important and what's not important than to just keep everything! There's always a chance that you'll screw up and get rid of something important. So why not just keep everything?
I have every digital file that I've created since I started using a digital camera in 1999. It's not that big a deal. I enjoy going back and looking at the listings that I shot back in 2000!