ComboBox Time Value/Command button click update

Attach workbook has a user form.

I have it close to functioning the way I need it to.

What I can't figure out is how to format the ComboBox to display the selected time (in minutes) and not a decimal value - if I select 00:01:00 it should stay 00:01:00.

Second, I need the times (labels where time calculation is displayed) to update every time the command button is clicked from the values in the ComboBoxs.

Also, it enters debug if the ComboBox times are selected first before clicking the command button, how can I get around this?

Any help is appreciated!

Thank you.