Using calculation and conditions in the time field to autofill another time field

We are trying to make a party form with a mandatory 2 hour party window.  Is there a way to allow the person to pick the start time of the party and then the end time will auto-populate the end time at 2 hours later?  We currently have the time to calculate total hours based on Start and End time.  Any help is appreciated.

Please give me some time to create a workaround for this inquiry. The time field have limitations in terms of calculation. I'll get back to you once I finish the demo form. Thank you for understanding.

Unfortunately, there is really no option to auto-fill another time field depending on the chosen value on another time field.

The solution I made was using the condition that calculates the value of the field. I created 2 drop downs (start time hours and minutes) and 1 text box (end time).

Once you chose a value in the hours, the condition will add 2 on it and then it will copy the value of the minutes.

Demo form: https://form.jotform.com/60723958514966

You can clone it if you like. Here is the condition I used:

Hope that helps. Thank you.

Thanks!  I'll play with these and see what happens.