Currently at 42k with a total of 5 oil changes. I did my 1st oil change around 5,000 and sent the oil off to Blackstone labs for an analysis. The numbers came back fine so I went around 7,000 next time and the numbers still looked good. 3rd oil change was 8,000 and still fine. My last 2 oil changes have been at 10,000 and Blackstone says I could extend that out even further based on the oil's TBN. As long as my vehicle is under warranty I'll keep changing it at 10,000 miles but it's nice knowing that I have some objective data that my oil still has life left in it, even at 10,000 miles.
I only use Mobile 1 5w-30 Extended Protection. I'm also pretty easy on my vehicle, light acceleration, and a higher percentage of highway miles.