Soz bud but there's some real crap in there
You actually seem to be insulting those Pros who are merely speedy ???
But I guess, hope, you don't mean that really
I honestly have no idea what you could be doing in editing just 300-500 images that'd take you two days or more of work, and if its because you dodge & burn every image and clone every stray hair, blemish or uneven brick, and still having to retouch images as you suggest then you are just doing something badly wrong
I've never had anyone ask for more editing of any of the images they are presented with, and at the end of my 3-4 hours session they are all good to go as final finished images
You simply cannot afford to be slow as the backlog idea is simply a FAB way to p**s everyone off and never recommend you
Dave