Hay, I run a price comparison site just for electrical goods, i submited my sitemap to google webmaster tools and within a week or so i was getting 1 - 2k hits aday and a few sales, after playing around with the price comparison script i broke part of it witch gave 404 error in google webmaster tools, i know have a a massive traffic lost maye 10 - 20 hits a day. I have fixed the errors any idea how long it could take for me to get the ranking back or could it be nothing to do with the 404 errors? Here is an image of my webmaster tools as is now:
Should be in less then 1 day if your having a good running website, otherwise it might take a few days.
I'd say about 48 hrs...considering this is a week to be HOLIDAYS, you might not see the results soon unless you are lucky & get a visit from Santa Hope things go well