JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Yes, that is possible with the use of our widgets.
You can select any of the following widgets that matches the style of your jotform:
You could also add a hidden date field with the clock turned on that will capture the time your users got on the jotform and match it against the submission time, but the widgets mentioned above would give you a nicer way to see the exact time that it took to complete the jotform, without you needing to calculate the time yourself.
If you want to limit how much they can spend on the jotform you might want to go for our Countdown widget.
You can read more about it in our Widgets news.