In order to know the last time that a changed was done in a estimate's process, an additional field was added to the estimate' listings: Modified On and Modified By.
Prevent Future Issues
If the field is not available in your jobs' list, right click the list and press Field Chooser. Add the field to the list by dragging it.
- Set on the user the role "EstimateNavigate".
- Create a new estimate.
- Move it to the next stage.
- Go to the estimates list and check the Modified On field.