// somewhere at the top of the page
var timeTracker = new TimeTracker();
timeTracker._recordStartTime();

// page load and setup

// now when the page is done loading...
timeTracker._recordEndTime();

// Specify your own histogram "action" values
timeTracker._setHistogramBuckets([10, 20, 50, 100, 500, 1000]);

// assuming pageTracker is called from _gat._getTracker(account) 
// and has been initialized with _initData()...
timeTracker._track(pageTracker);