After I went to bed last night I remembered that I had actually gone with a 35ft cable after waffling between 25 and 35 feet. That puts me at 41 feet.

I might look for a female/female HDMI connector and test the combined cable length. I did some reading after reading your post and I've seen 10m referenced wrt 1080p. I definitely exceed that.

A 25 foot cable (I think it would be long enough) would put me back inside the 10m range, but it's an expensive test to run (and not easy in my case).

My cable is 24awg (which seems decent when compared to others), but I have found some 22awg.

I wish there were a cheaper/easier way to figure this out.

Thanks for your help.