a href="shorttime_to_seconds.html">shorttime_to_seconds()</a>
    			for more on <i>short time</i> format.
    		</li>
    		<li><strong>a SELECT query</strong>: query is re-evaluated at the end of each iteration.
    			Loop terminates when query evaluates to a TRUE value. The query must return with one
    			single row and one single value.
    		</li>
    	</ul>
    </li>
  </ul>
  Since the routines relies on <a href="exec.html">exec()</a>, it accepts the following
  input config:
  <ul>
    <li><stron