Use the Repeated Survey types when you want to deliver the same survey at the same time/day for a defined period of time (e.g. every Monday at 6.30pm for the next 5 weeks, or Wednesdays at 9.45 am for the next 4 weeks, etc.). When you select "Repeated" from the drop down menu an additional pop-up window will open up. This allows you to define up to 20 repeating days/times. Use as many of these as you want as long as you aware of not overlapping survey availability windows. .

Choose the Day (from the drop down menu) then the Hour, Minutes and AM/PM. If you choose, for instance, Monday 6:30PM then the App will alert your participant every Monday at this time within the Start End Dates you chose earlier. 

Make sure there is at least 1 day between your Start and End day.