Bulls**t! He might be waiting endlessly until he see any changes within his sitemap. Don't you see a red cross? It means that Google haven't accepted his sitemap yet. And never will because there're some errors in it. I repeat - if you have a red cross next to your sitemap, click on sitemap's name and you'll see what error doesn't let Google to accept your sitemap. You'll be surprised when after fixing all errors you'll see lots of your pages are already indexed.
I presume whether you have a syntax error by which Google is not Parsing your sitemap. Get your sitemap fixed by removing the bugs in it.