I use RSS with most of the realism overhaul stuff, and noticed when launching a geosynchronous satellite that when circularized at 35,786km that my orbital period was over 3 days. I guess I missed a setting to stop using stock kerbin days?

For those who don't know, stock size learning has 6 hour days, while in RSS, it is upscaled to be equal to one earth day, which is somewhere roughly around 24 hours (I know its a few minutes less but I can't remember the exact #).

Yes you missed the setting, but its in the stock game settings panel, not MJ's.