From Admin Panel you can define the pulse survey frequency to mesure user's status. There are three options available:
Every week: 7 calendar days from the last reply
Every two weeks: 15 calendar days since the last reply
Every month: 30 calendar days since the last reply
The replies goes from Horrible, Bad, Normal, Good to Incredible.
If your users click on "Reply on another time", the survey will be paused for the time established on configurations.
Note: At the moment, it is not possible to modify the question asked to collaborators.