+ * The crawler will run if it is triggered in the range between the minimum (included)
+ * and maximum (included) hour of the day if either
+ * <ul>
+ * <li>it is triggered for the first time on the current day.</li>
+ * <li>an earlier crawling attempt on the same day failed. </li>
+ * </ul>
+ * @param aCrawler The interface through which the crawler is executed.