Only a few bucks. The reason for that is, I have only 19 Hubs, and hardly any incoming links to my Hubs. I am working to do the following, which is what we need to do to make money with AdSense here:
1) LOTS of Hubs (100 absolute minimum, many more better).
2) Hubs are commercial (product or money making related).
3) Visitors coming to your Hub have had to be motivated to search for you; they are not just another curious Hubber. That usually means they find you through Google search. That means they are more likely to click on AdSense adverts.
4) All those criteria have to be satisfied to make money.
See my profile and look for the Courtney Tuttle link for more details.