How to calculate the time for filling out an application by a user and send the data to the right address?

Question

WordPress

Hello!
There is a site on wordpress and there is an application form.
How to calculate the time spent by the user (from the moment the page was opened) to fill out the application and send the data by e-mail?

Answer 1

1) Add a hidden input to the form with the time of accessing the form page.
2) Connect the Yandex metric and hang it on the event form.