--- a/mod_log_mark/mod_log_mark.lua	Sun May 08 16:57:44 2016 +0200
+++ b/mod_log_mark/mod_log_mark.lua	Sun May 08 18:05:41 2016 +0200
@@ -2,7 +2,7 @@
 
 local log = _G.log;
 
-module:add_timer(60-os.date("%S"), function ()
+module:add_timer(60-os.date("%S"), function (now)
 	log("info", "-- MARK --");
-	return 60;
+	return 90 - ((now + 30) % 60);
 end);