Basically, the way it works (or at least worked before everything went strange) was this:
Around the 20th of the month the Googlebot would go to all sites on the internet (in the index). This takes about a week and at some point it will visit your site and re-spider all the pages. Following this, the new index will appear on www2 and/or www3. For a few days, these new results are very unstable and jump from datacenter to datacenter, sites move around in the rankings and basically everything changes (hence the name the Google Dance).
Following that, ususally early in the month, the index will stabalise and move to www. Then the whole process begins again! There is a slight difference for bigger sites. Those that have high pageranks (5+?) or update a lot get spidered by FreshBot. This is a special Googlebot that visits sites more regularly, spidering just the new pages.
So to answer your questions, your month's updates will only be picked up when the Googlebot goes round (unless you have a large site) and will eventually appear on Google. Theres really no way to predict all of this, though.
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