retryDelayInSeconds property
The amount of time, in seconds, Workers must wait after taking the Qualification test before they can take it again. Workers can take a Qualification test multiple times if they were not granted the Qualification from a previous attempt, or if the test offers a gradient score and they want a better score. If not specified, retries are disabled and Workers can request a Qualification only once.
Implementation
final int? retryDelayInSeconds;