>How do I calculate how long a timer has been going?

I am guessing here you are looking for a cumulative measure. Try something like this:

Create a custom property called TotalTime and initialize it to 0
In the Timer() Event - issue this code:

This.TotalTime = This.TotalTime + This.Interval

You will need to account for things like a nodefault in the Timer(). You will still want to track how long the Timer has been active. Also, you will want to place code in the Reset(). Something like: This.TotalTime = 0.

HTH,