let me say it to you to understand:
if you have a small website it will take up to 3 weeks…
Now if you have a bigger site and lets say you have less than 500 queries on the keywords it will take the same amount of time …. But if you have a site which has over 500 keywords on your google webmaster tools means that this should happen in the same day(the indexing) or lets say when google will come with the next crawl.
hope this help …. this is what i know for sure …