diff --git a/config.json.example b/config.json.example
index 9ff9799..fbe1a37 100644
--- a/config.json.example
+++ b/config.json.example
@@ -8,6 +8,7 @@
   "mapSigmaScale": 0.5,
   "showContact": true,
   "maxAge": 14,
+  "blinkingHours": 8,
   "mapLayers": [
     { "name": "MapQuest",
       "url": "https://otile{s}-s.mqcdn.com/tiles/1.0.0/osm/{z}/{x}/{y}.jpg",
diff --git a/lib/map.js b/lib/map.js
index 8742331..dabae33 100644
--- a/lib/map.js
+++ b/lib/map.js
@@ -2,8 +2,6 @@ define(["map/clientlayer", "map/labelslayer",
         "d3", "leaflet", "moment", "locationmarker", "rbush",
         "leaflet.label", "leaflet.providers"],
   function (ClientLayer, LabelsLayer, d3, L, moment, LocationMarker, rbush) {
-    var blinkingHours = 8
-
     var options = { worldCopyJump: true,
                     zoomControl: false
                   }
@@ -455,7 +453,7 @@ define(["map/clientlayer", "map/labelslayer",
 
         var markersLost = data.nodes.lost.filter(has_location)
           .map(mkMarker(nodeDict, function (d) {
-            if (d.lastseen.isAfter(moment(data.now).subtract(blinkingHours, "hours")))
+            if (d.lastseen.isAfter(moment(data.now).subtract(config.blinkingHours, "hours")))
               return iconAlert
 
             return iconLost