How can I have Atooma perform a task everytime a certain time span passes?
There is a module specifically introduced to allow Atooma to perform a certain DO with a recurring time interval.
When you're setting the first IF as a trigger for the smart action (not sure about what a trigger is? Read this article to find out) go into the MOBILE cluster, tap on the TIME module and then choose the COUNTDOWN module.
From here you will have to set the parameters for the countdown. First, set the desired time, then tap DONE in the lower corner of the screen. Now you will be able to choose wether you want the countdown to be executed once, or repeatedly.
Set a repeated countdown to have Atooma executing the DO whenever the countdown ends.