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.

import time

def retry(retry_count, delay_in_seconds):
    start_time = time.time()
    print("Start time: " + str(start_time))
    for i in range(retry_count):
        time.sleep(delay_in_seconds)
        current_time = time.time()
        print("Current time: " + str(current_time))
        print("Duration: " + str(current_time-start_time))
        print("Try number: " + str(i))

retry(3, 2)