code: @Deprecated
      public int getDelay(StaplerRequest req) throws ServletException {
          String delay = req.getParameter("delay");
          if (delay==null)    return getQuietPeriod();
  
          try {
              // TODO: more unit handling
              if(delay.endsWith("sec"))   delay=delay.substring(0,delay.length()-3);
              if(delay.endsWith("secs"))  delay=delay.substring(0,delay.length()-4);
              return Integer.parseInt(delay);
          } catch (NumberFormatException e) {
              throw new ServletException("Invalid delay parameter value: "+delay);
          }
      }
docs: Computes the delay by taking the default value and the override in the request parameter into the account.
  
  @deprecated as of 1.489
  Inject {@link TimeDuration}.