Clarify the documentation. Add the hash config to the example config. Uses duration in the delay field instead of the seconds.

src/main/java/io/kamax/mxisd/config/DurationDeserializer.java

@@ -0,0 +1,30 @@
+package io.kamax.mxisd.config;
+
+public class DurationDeserializer {
+
+    public long deserialize(String argument) {
+        long duration = 0L;
+        for (String part : argument.split(" ")) {
+            String unit = part.substring(part.length() - 1);
+            long value = Long.parseLong(part.substring(0, part.length() - 1));
+            switch (unit) {
+                case "s":
+                    duration += value;
+                    break;
+                case "m":
+                    duration += value * 60;
+                    break;
+                case "h":
+                    duration += value * 60 * 60;
+                    break;
+                case "d":
+                    duration += value * 60 * 60 * 24;
+                    break;
+                default:
+                    throw new IllegalArgumentException(String.format("Unknown duration unit: %s", unit));
+            }
+        }
+
+        return duration;
+    }
+}