No oil should ever be changed by how many miles are on it, and a change schedule should never be determined by what the internet recommends.
There is only 1 correct way to find out how far you can push change intervals safely, Used Oil Analysis. This is where you take a sample of new oil and samples at various times to find out the condition of the oil at that point in time and the condition of the oil. You mail it in and they mail back recommendations.
My gripe with mile ratings is that no one is stating their typical driving style, routes or anything. You don't know if they do 90% stop and go or lots of highway driving. That all makes a big difference.
Basing oil changes on run time hours is more accurate, but not exact. Running hours figures that the oil has seen near the same amount of contaminates. Think hours run vs 30mph average over 3,000 miles (100 hours) vs 60mph average (50 hours). Significant difference there.
Spend the maybe $50 to find out how far you can push oil. In the long run it will save you money if you stick to the schedule.