Is there a timer widget that can be configured to submit a form when it reaches 0?

We are looking to use JotForm tests and want to set up a timer to submit the test once the time is up.

Is this possible?  If so, how do we do it?

You should be able to use the global countdown widget:

https://widgets.jotform.com/widget/global_countdown

Note that it will fail to submit if any required fields haven't been filled in.

I tried to create a demo and failed. So please let us know if it doesn't work for you. If it doesn't work we can submit a bug report. And the developers will hopefully fix it.