how much time does it take to get from the domestic terminal (United) to the International terminal (United), No luggage ?

15-30 minutes

Very helpful. Thank you.

I depends on how busy the airport is but you can generally assume you can physically get from one to the other in about 20-30 minutes. Be sure though to consider how much time you'll need on the departing gate before they actually close doors for departure. I would give myself 40-45 minutes to be safe (you can always use any leftover time for a bio-break!). Good luck and safe travels!