I put nearly 200 photos through the ScanSnap in less than an hour while I was talking on the phone the other morning. It pretty much does everything for you. I feed them through individually after sorting a bit by size. It seems to work best if the guides are adjusted to the size of the picture but after the first couple that is pretty mindless. It scanned both sides if there was anything on the back at all. Some of the photos I put through are least 80 years old.
In some cases it assigned a number to the scanned pictures which would indicate the front and back are together and in some cases it didn't. I didn't feel it necessary to spend time trying to figure that out.
I have no idea how many pictures I have. There are more in that box and I have two additional larger boxes. I easily have 2,000 more. It won't happen overnight but I am now confident I will get them done. It's much easier and faster with the ScanSnap than the flatbed scanner I was trying to use [which is perfect for stacks of single sided pages and does legal size] and does not require as much of my attention.
After the pictures are scanned I spend time renaming them with names to indicate who is in the picture. Those that I have no idea or not enough information keep their scanner assigned number which makes them stand out as unidentified. It is easy to work with them in the ScanSnap Organizer although you don't have to use it.
All my pictures are saved to a 1 TB NAS drive, that is a large drive attached to my router and available from any computer [or iPod or SmartPhone] on my network. There Picasa automatically begins working on the face recognition. Read about that here. It does some amazing things, sometimes telling me who is in the unknown pictures.