Show elapsed time on the thank-you page?

Show elapsed time on the thank-you page?

Is it possible to display the total time a user spent filling out a Zoho Form on the thank-you?
I’d like to show the difference between the `form submission timestamp` and the `start time` (currently have a hidden Date-Time field set to autofill the date and time of the response) in minutes. So something like this:
  1. Start On: ${zf:DateTime}
  2. Submitted On: ${zf:ADDED_TIME}
  3. Start Time Spent:  [??] minutes
Any suggestions on how to achieve this within Zoho Forms? Thanks!