The length of time between who often Roku checks our feed for any updates is pretty significant. Is there a way to force/ping Roku to say, "Hey Roku, there's new content available. . .come get it!"?
Without knowing the application and how you post your feed file, I could only speculate.
@podworx you can have the same result if you go into the channel settings and save anything in there without actually changing something. lets say you go into Categories and just hit Save , then go into Feed Status , in the right side on the monitor you will see a Refresh Feed button ,
click on that give it couple of minutes , and you can see the result , if everything is ok just publish the channel with the "new" modified content , that's all.