Hello Scot Shields,
I found this article - How To Forecast With Tableau And R | Data Science Riot! that may be helpful with this. I've also sent a message to Bora Beran to see if he might have an idea although I think he is out of office this week.
jjearnts <- ts(u,frequency=24);
fcast <- forecast(jjearnts, h=.arg2);
Does this help?