Too much time..
Big tip I think is to have it as automated as possible. The more you automate, the less "work" you need to do, also the more time you save. When I first started, I did everything by hand and it was so fricking time consuming. Also, really think it out and set it up right the first time. If I knew what I know now, when I started, some of my sites would have a much different structure.
Ya, your right, it's more than just one gallery page to look at, so gonna be more time. Also, have a script/system that will get rid of the crap on submit, so you dont even have to review the ones that wont make it in the first place.
ronnie