If the shutdown timer is started, then show how much time you have.

def countdown(t):
  while t:
    mins, secs = divmod(t, 60)
    timeformat = '{:02d}:{:02d}'.format(mins, secs)
    print(timeformat, end='\r')
    time.sleep(1)
    t -= 1
  print('Goodbye!\n')
    
countdown(10)