Ah, no, sorry, I must have missed that. You could go back to the Rule Machine idea. To get the repeated notifications, you could use some idea from this thread:
And actually, come to think of it, the built-in Notifications app might even be able to do that all instead. What I don't remember off the top of my head is if it can handle the "6 hours" thing, as I know there were some limits on time for certain things when I looked at this in the past...