When requests to Step Function fail, Workflow Service performs exponential backoff retries to notify Step Function service. Number of retries = 3 The total duration of all attempts doesn't exceed 10 seconds.

public void getRetries() {
    int numRetries = 3;
    long delay = 1000;
    int i = 0;
    while (i < numRetries) {
        try {
            ...
        } catch (Exception e) {
            i++;
            if (i == numRetries) {
                throw e;
            }
            delay = delay * 2;
            Thread.sleep(delay);
        }
    }
}