Index: src/org/openstreetmap/josm/Main.java
===================================================================
--- src/org/openstreetmap/josm/Main.java	(revision 1091)
+++ src/org/openstreetmap/josm/Main.java	(working copy)
@@ -267,7 +267,7 @@
 		{
 			long tim = System.currentTimeMillis();
 			long last = Main.pref.getLong("pluginmanager.lastupdate", 0);
-			Integer maxTime = Main.pref.getInteger("pluginmanager.warntime", 30*24*60*60);
+			Integer maxTime = Main.pref.getInteger("pluginmanager.warntime", 30);
 			if(last <= 0)
 			{
 				Main.pref.put("pluginmanager.lastupdate",Long.toString(tim));
@@ -272,9 +272,9 @@
 			{
 				Main.pref.put("pluginmanager.lastupdate",Long.toString(tim));
 			}
-			else if(tim - last >= maxTime*1000*24*60*60)
+			else if(tim - last >= maxTime*1000l*24*60*60)
 			{
-				long d = (tim - last)/(24*60*60*1000);
+				long d = (tim - last)/(24*60*60*1000l);
 				JOptionPane.showMessageDialog(Main.parent, tr("Last plugin update more than {0} days ago.", d));
 			}
 		}