Depends on the type of pro. A sports shooter can easily go through 1000 frames per day. I do it, and some of the real pros I know go through three or four times as much sometimes.
On the other hand, a pro that specializes in landscape or travel is going to have a pretty tough time shooting 1000 frames in a day, especially on a sustained basis. When I'm shooting stuff like what would end up in a gallery, I am lucky to shoot 1 frame per minute and even at that I may be rushing.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!