The beauty of open carry is that with a good holster, it is comfortable to carry a full-size handgun. That barrel length is fine, if comfortable for YOU. No one else can answer in more detail. There is nothing wrong with seeing a gentleman carrying a full-size revolver. The fact that so many have moved toward smaller guns is their problem, not yours. Don't let it cause you to feel out of place.
I routinely carry my 7-1/2" Ruger Vaquero .45, even in downtown Las Vegas.