I was right the first time with drawTimeout

apps/bigdclock/ChangeLog

@@ -1,3 +1,4 @@
 0.01: Initial version
 0.02: setTimeout bug fix; no leading zero on date; lightmode; 12 hour format; cleanup
 0.03: Internationalisation; bug fix - battery icon responds promptly to charging state
+0.04: bug fix

apps/bigdclock/bigdclock.app.js

@@ -16,6 +16,7 @@ var drawTimeout;
 function queueDraw() {
     if (drawTimeout) clearTimeout(drawTimeout);
     drawTimeout = setTimeout(function () {
+        drawTimeout = undefined;
         draw();
     }, 60300 - (Date.now() % 60000)); // We aim for 300ms into the next minute to ensure we make it!
 }

apps/bigdclock/metadata.json

@@ -1,7 +1,7 @@
 { "id": "bigdclock",
   "name": "Big digit clock containing just the essentials",
   "shortName":"Big digit clk",
-  "version":"0.03",
+  "version":"0.04",
   "description": "A clock containing just the essentials, made as easy to read as possible for those of us that need glasses. It contains the time, the day-of-week, the day-of-month, and the current battery state-of-charge.",
   "icon": "bigdclock.png",
   "type": "clock",