How to get auto update a user defined field with age of defect automatically

Hi,

We are planning to add a new user defined field called "Age" to calculate and update age of defect. We are ready with code and we put it in Bug_Move To function which will run and update the age of defect once we highlight defect.

But we want to auto refresh this field automatically every 30mins, is their a way to do this.?

Note: we are thinking to impliment this by adding a button to defect toolbar.

Thanks,

Subbarao