I would hope quite a lot. I'm getting several blocks per day on my desktop (AMD FX8350) using qubit-cpuminer (as found in the first post). (The built in miner is slower.)

In case anyone is unclear on how to do that:
./minerd -a qubit -o http://127.0.0.1:7799 -u QubitCoinrpc -p

Obviously if you changed the port or user in your conf you need to use what you set them to, but those are the defaults. (Well, they were the defaults for me, but I probably managed to do something unusual. minerd will give an error if you get it wrong at least.)