Researchers may activate a schedule randomization feature for select surveys; this generates a random, narrowed window of availability within the survey timeslot. For example, a survey timeslot may scheduled for 1:00pm-4:00pm, but the randomization window may be set for 15 minutes. The survey will automatically open up for 15 minutes at any point during the 1:00pm-4:00pm timeslot. With this function enabled, it is important to take the survey right away after receiving a notification so as not to miss it.
Randomized schedules are indicated by a grey "shuffle" icon in the bottom right corner of a survey window:
You will receive a notification when the survey becomes available, including the amount of time you have to complete it: