You may have said this already but how often do you suggest changing it?
I suggest that it get changed at 50k miles. I was lazy and as you can tell didn't get to it then. But from what I have seen it could have gone to 100k with no problems. If you buy your vehicle new and get a chance to change the fluid out at 10k to get the breakin floaty's out I don't see why you can't go to 50k on the filter change. Also go by the owners manual. Every vehicle is different to a point. Heck some don't have a filter like our 08 GMC Acadia.